The Smart Device Compare comparison

Shelly Presence Gen4 vs Third Reality Smart Presence Sensor R3

Understand the differences. Decide what matters to your home.

Before you compare every specification

Key differences between Shelly Presence Gen4 and Third Reality Smart Presence Sensor R3

A summary of selected recorded differences between these presence sensors. Check the full specification table below for details and conditions.

Feature differences among your selected devices

2.4 GHz Wi-Fi (connectivity): Shelly Presence Gen4 — Yes (Wi-Fi 6, 802.11 b/g/n/ax on 2401-2483 MHz.); Third Reality Smart Presence Sensor R3 — No.
Bluetooth (connectivity): Shelly Presence Gen4 — Yes (Bluetooth 5 LE for onboarding.); Third Reality Smart Presence Sensor R3 — No.
Multi Person Detection (features): Shelly Presence Gen4 — Yes (Identifies up to 6 people at once and maps them onto up to 10 customizable detection zones.); Third Reality Smart Presence Sensor R3 — No (Reports a single binary occupancy state, with no person count and no zone or position tracking.).
Matter (integrations): Shelly Presence Gen4 — Yes (Matter over Wi-Fi. CSA certificate CSA25E3FMAT48529-24, certified 2025-11-18, vendor 0x1490 product 0x1821.); Third Reality Smart Presence Sensor R3 — No (A Zigbee 3.0 device. Neither model 3RPL01084Z nor a Third Reality presence sensor appears in the CSA certified products database, and the manufacturer claims no Matter support. Matter platforms reach it only through the separate Smart Bridge MZ1.).

Specifications to check side by side

Range Of Detection (features): Shelly Presence Gen4 — 8m / 26ft; Third Reality Smart Presence Sensor R3 — 6m / 19ft.
Apple Home (integrations): Shelly Presence Gen4 — Yes (Via Matter); Third Reality Smart Presence Sensor R3 — Smart Bridge MZ1 required (Not a HomeKit or Matter endpoint on its own. Apple Home reaches it through Third Reality's Smart Bridge MZ1, the manufacturer's Zigbee to Matter bridge, which the R3 listing names as a supported system.).
Google Home (integrations): Shelly Presence Gen4 — Yes (Via Matter. Shelly also lists the Google Smart Home Occupancy Sensing trait.); Third Reality Smart Presence Sensor R3 — Smart Bridge MZ1 required (No direct path: Google Home has no Zigbee radio. Third Reality's own Smart Bridge MZ1 republishes its Zigbee devices over Matter, and the manufacturer names the MZ1 as one of the three systems that read this sensor's data.).
Wired (power): Shelly Presence Gen4 — Yes (Powered by USB-C at 5 VDC, 1 A. Nominal consumption 2.5 W, 3.5 W maximum. There is no battery option.); Third Reality Smart Presence Sensor R3 — USB-C (Powered over USB-C at 5V/1A for continuous always-on operation, with no batteries involved.).

Information still to confirm

4 of 25 comparison fields lack a resolved value for at least one selected device. Missing information is not evidence that a feature is absent.
Check the full table and manufacturer documentation before ruling out a device.

These observations are derived from recorded catalog data and have not all been independently verified. Confirm details with the manufacturer before purchasing.

Compare capabilities, compatibility and setup requirements.

Option 1 · Shelly

Shelly Presence Gen4

Last updated October 2026

View full device profile

Option 2 · Third Reality

Third Reality Smart Presence Sensor R3

Last updated October 2026

View full device profile

What the catalog tells us

Understand the tradeoffs.

These counts describe the available data, not a quality score. More features do not automatically make a better device.

8differences with recorded values for every device

4rows with missing or unspecified information

Consider your setup

Apple Home

Shelly Presence Gen4Yes
Third Reality Smart Presence Sensor R3Smart Bridge MZ1 required

Confirm which features appear in Apple Home and whether extra hardware or a subscription is needed for your intended use.

Inspect the specifications

Consider your setup

Matter

Shelly Presence Gen4Yes
Third Reality Smart Presence Sensor R3No

Confirm the exact device type and the features exposed in your chosen platform. Protocol support does not establish feature parity across apps.

Inspect the specifications

Your priorities, side by side

Focus on what changes.

Mark the specifications you care about. Open manufacturer sources for verification scope; fields without citations remain catalog data. Expand notes for other qualifications.

Differences onlyMy priorities (0)

Showing 25 of 25 rows. “Not recorded” does not mean “No”.

Reading layout

Alerts

Fall Alerts

Shelly Presence Gen4: No
Third Reality Smart Presence Sensor R3: No

Presence Alerts

Shelly Presence Gen4: Yes
Catalog note
Presence and vacancy can trigger lights, HVAC, blinds, security or a notification through Shelly Smart Control, Matter or local webhooks.
Third Reality Smart Presence Sensor R3: Yes
Catalog note
Presence and absence can trigger lights, notifications or any other automation in a compatible smart home system, and the built-in RGB light doubles as a local status indicator.

Connectivity

2.4 GHz Wi-Fi

Shelly Presence Gen4: Yes
Catalog note
Wi-Fi 6, 802.11 b/g/n/ax on 2401-2483 MHz.
Third Reality Smart Presence Sensor R3: No

5 GHz Wi-Fi

Shelly Presence Gen4: No
Third Reality Smart Presence Sensor R3: No

Bluetooth

Shelly Presence Gen4

Yes

Manufacturer source

Bluetooth 5 LE is specified.

Shelly Presence Gen4 manufacturer product page →

Source section: Technical details: device description and main features
Model: Shelly Presence Gen4
Region: Manufacturer product page; no universal regional compatibility implied
Firmware: Not specified by this source
Checked: 2026-10-04

Coverage is a manufacturer maximum, not a measured result for every room. The page gives conflicting occupant limits in different sections; no exact occupant count is asserted here.

Document check only; not a hands-on test or verification of every regional or firmware variant.

Catalog note

Bluetooth 5 LE for onboarding.

Third Reality Smart Presence Sensor R3

Thread

Shelly Presence Gen4: No
Third Reality Smart Presence Sensor R3: No

Z Wave

Shelly Presence Gen4: No
Third Reality Smart Presence Sensor R3: No

Zigbee

Shelly Presence Gen4: Zigbee Hub required
Catalog note
Zigbee 3.0 (802.15.4). A five-press on the button switches the firmware between Matter over Wi-Fi (the default) and Zigbee. Using the Zigbee radio needs a Zigbee coordinator.
Third Reality Smart Presence Sensor R3: Zigbee Hub required
Catalog note
Zigbee 3.0 end device. It needs a Zigbee hub or coordinator: Home Assistant (ZHA or Zigbee2MQTT), SmartThings (2015/2018), Aeotec, or an Echo device with a built-in Zigbee hub.

Features

Angle Of Detection

Shelly Presence Gen4: 140° Horizontal / 120° Vertical
Third Reality Smart Presence Sensor R3: Not recorded

Area Of Detection

Shelly Presence Gen4

42 m²

Manufacturer source

The stated detection area is up to 42 square metres.

Shelly Presence Gen4 manufacturer product page →

Source section: Technical details: device description and main features
Model: Shelly Presence Gen4
Region: Manufacturer product page; no universal regional compatibility implied
Firmware: Not specified by this source
Checked: 2026-10-04

Coverage is a manufacturer maximum, not a measured result for every room. The page gives conflicting occupant limits in different sections; no exact occupant count is asserted here.

Document check only; not a hands-on test or verification of every regional or firmware variant.

Third Reality Smart Presence Sensor R3

Not recorded

Automations

Shelly Presence Gen4: Yes
Catalog note
20 schedules, scripting, MQTT, 20 webhooks and local logic on the device, plus Matter occupancy for platform automations.
Third Reality Smart Presence Sensor R3: Yes
Catalog note
Six adjustable detection levels (1 to 6 m), a configurable presence hold time and a TVOC alert threshold, so presence, illuminance and air quality can all drive automations on the hub.

History Records

Shelly Presence Gen4: Not recorded
Third Reality Smart Presence Sensor R3: Not recorded

Multi Person Detection

Shelly Presence Gen4

Yes

Manufacturer source

The sensor supports simultaneous detection of multiple occupants.

Shelly Presence Gen4 manufacturer product page →

Source section: Technical details: device description and main features
Model: Shelly Presence Gen4
Region: Manufacturer product page; no universal regional compatibility implied
Firmware: Not specified by this source
Checked: 2026-10-04

Coverage is a manufacturer maximum, not a measured result for every room. The page gives conflicting occupant limits in different sections; no exact occupant count is asserted here.

Document check only; not a hands-on test or verification of every regional or firmware variant.

Catalog note

Identifies up to 6 people at once and maps them onto up to 10 customizable detection zones.

Third Reality Smart Presence Sensor R3

Catalog note

Reports a single binary occupancy state, with no person count and no zone or position tracking.

Range Of Detection

Shelly Presence Gen4: 8m / 26ft
Third Reality Smart Presence Sensor R3: 6m / 19ft

Sleep Monitoring

Shelly Presence Gen4: No
Third Reality Smart Presence Sensor R3: No

Zigbee Router

Shelly Presence Gen4: Not recorded
Catalog note
USB-C powered and able to join a Zigbee network, but Shelly's knowledge base does not say whether it repeats traffic as a Zigbee router.
Third Reality Smart Presence Sensor R3: Yes
Catalog note
Mains powered over USB-C and always on, so it also acts as a Zigbee repeater and strengthens the mesh for other devices.

Integrations

Alexa

Shelly Presence Gen4: Yes
Catalog note
Via Matter. Shelly also lists the Alexa Motion Sensor capability.
Third Reality Smart Presence Sensor R3: Yes
Catalog note
Works with Echo devices that have a built-in Zigbee hub, including Echo (4th Gen), Echo Plus (1st and 2nd Gen), Echo Studio, Echo Show 8 (3rd Gen), Echo Show 10 (2nd and 3rd Gen), Echo Hub, Eero 6 and Eero Pro 6.

Apple Home

Shelly Presence Gen4: Yes
Catalog note
Via Matter
Third Reality Smart Presence Sensor R3: Smart Bridge MZ1 required
Catalog note
Not a HomeKit or Matter endpoint on its own. Apple Home reaches it through Third Reality's Smart Bridge MZ1, the manufacturer's Zigbee to Matter bridge, which the R3 listing names as a supported system.

Google Home

Shelly Presence Gen4: Yes
Catalog note
Via Matter. Shelly also lists the Google Smart Home Occupancy Sensing trait.
Third Reality Smart Presence Sensor R3: Smart Bridge MZ1 required
Catalog note
No direct path: Google Home has no Zigbee radio. Third Reality's own Smart Bridge MZ1 republishes its Zigbee devices over Matter, and the manufacturer names the MZ1 as one of the three systems that read this sensor's data.

Home Assistant

Shelly Presence Gen4: Yes
Catalog note
Via Matter. Shelly's knowledge base also lists Home Assistant as a supported platform, plus local MQTT, webhooks and an embedded web interface.
Third Reality Smart Presence Sensor R3: Yes
Catalog note
Supported through both ZHA and Zigbee2MQTT. Zigbee2MQTT documents model 3RPL01084Z and exposes occupancy, illuminance, TVOC, the RGB light, presence sensitivity and presence hold time.

Matter

Shelly Presence Gen4

Yes

Manufacturer source

Matter uses the Wi-Fi connection.

Shelly Presence Gen4 manufacturer product page →

Source section: Technical details: device description and main features
Model: Shelly Presence Gen4
Region: Manufacturer product page; no universal regional compatibility implied
Firmware: Not specified by this source
Checked: 2026-10-04

Coverage is a manufacturer maximum, not a measured result for every room. The page gives conflicting occupant limits in different sections; no exact occupant count is asserted here.

Document check only; not a hands-on test or verification of every regional or firmware variant.

Catalog note

Matter over Wi-Fi. CSA certificate CSA25E3FMAT48529-24, certified 2025-11-18, vendor 0x1490 product 0x1821.

Third Reality Smart Presence Sensor R3

Catalog note

A Zigbee 3.0 device. Neither model 3RPL01084Z nor a Third Reality presence sensor appears in the CSA certified products database, and the manufacturer claims no Matter support. Matter platforms reach it only through the separate Smart Bridge MZ1.

SmartThings

Shelly Presence Gen4: Yes
Catalog note
Via Matter. Shelly also lists the SmartThings Presence Sensor capability.
Third Reality Smart Presence Sensor R3: Yes
Catalog note
Pairs as a standard Zigbee device with SmartThings (2015/2018) hubs and the Aeotec Smart Home Hub, per the manufacturer's compatibility list.

Power

Wired

Shelly Presence Gen4

Yes

Manufacturer source

Continuous power is supplied through 5 V USB-C.

Shelly Presence Gen4 manufacturer product page →

Source section: Technical details: device description and main features
Model: Shelly Presence Gen4
Region: Manufacturer product page; no universal regional compatibility implied
Firmware: Not specified by this source
Checked: 2026-10-04

Coverage is a manufacturer maximum, not a measured result for every room. The page gives conflicting occupant limits in different sections; no exact occupant count is asserted here.

Document check only; not a hands-on test or verification of every regional or firmware variant.

Catalog note

Third Reality Smart Presence Sensor R3

USB-C

Catalog note

Powered over USB-C at 5V/1A for continuous always-on operation, with no batteries involved.

Sensors

Light

Shelly Presence Gen4

Yes

Manufacturer source

The light sensor reports dark, twilight and bright states.

Shelly Presence Gen4 manufacturer product page →

Source section: Technical details: device description and main features
Model: Shelly Presence Gen4
Region: Manufacturer product page; no universal regional compatibility implied
Firmware: Not specified by this source
Checked: 2026-10-04

Coverage is a manufacturer maximum, not a measured result for every room. The page gives conflicting occupant limits in different sections; no exact occupant count is asserted here.

Document check only; not a hands-on test or verification of every regional or firmware variant.

Catalog note

Built-in light sensor that reports dark, twilight and bright states for lighting-aware automations.

Third Reality Smart Presence Sensor R3

Yes

Catalog note

Built-in ambient light (Lux) sensor. Zigbee2MQTT exposes illuminance and an illuminance calibration setting.

Presence

Shelly Presence Gen4

Yes

Manufacturer source

Presence detection uses millimetre-wave radar.

Shelly Presence Gen4 manufacturer product page →

Source section: Technical details: device description and main features
Model: Shelly Presence Gen4
Region: Manufacturer product page; no universal regional compatibility implied
Firmware: Not specified by this source
Checked: 2026-10-04

Coverage is a manufacturer maximum, not a measured result for every room. The page gives conflicting occupant limits in different sections; no exact occupant count is asserted here.

Document check only; not a hands-on test or verification of every regional or firmware variant.

Catalog note

60-64 GHz mmWave radar that detects people who are sitting still, with still detection out to 3 m and tracking of up to 6 people across up to 10 zones.

Third Reality Smart Presence Sensor R3

Yes

Catalog note

60 GHz mmWave radar that holds detection on a person who is sitting still, reading the micro-movements of breathing.

Specifications for Shelly Presence Gen4 versus Third Reality Smart Presence Sensor R3
Specification	Shelly Presence Gen4	Third Reality Smart Presence Sensor R3
Alerts
Fall Alerts	No	No
Presence Alerts	Yes Catalog note Presence and vacancy can trigger lights, HVAC, blinds, security or a notification through Shelly Smart Control, Matter or local webhooks.	Yes Catalog note Presence and absence can trigger lights, notifications or any other automation in a compatible smart home system, and the built-in RGB light doubles as a local status indicator.
Connectivity
2.4 GHz Wi-Fi	Yes Catalog note Wi-Fi 6, 802.11 b/g/n/ax on 2401-2483 MHz.	No
5 GHz Wi-Fi	No	No
Bluetooth	Yes Manufacturer source Bluetooth 5 LE is specified. Shelly Presence Gen4 manufacturer product page → Source section Technical details: device description and main features Model Shelly Presence Gen4 Region Manufacturer product page; no universal regional compatibility implied Firmware Not specified by this source Checked 2026-10-04 Coverage is a manufacturer maximum, not a measured result for every room. The page gives conflicting occupant limits in different sections; no exact occupant count is asserted here. Document check only; not a hands-on test or verification of every regional or firmware variant. Catalog note Bluetooth 5 LE for onboarding.	No
Thread	No	No
Z Wave	No	No
Zigbee	Zigbee Hub required Catalog note Zigbee 3.0 (802.15.4). A five-press on the button switches the firmware between Matter over Wi-Fi (the default) and Zigbee. Using the Zigbee radio needs a Zigbee coordinator.	Zigbee Hub required Catalog note Zigbee 3.0 end device. It needs a Zigbee hub or coordinator: Home Assistant (ZHA or Zigbee2MQTT), SmartThings (2015/2018), Aeotec, or an Echo device with a built-in Zigbee hub.
Features
Angle Of Detection	140° Horizontal / 120° Vertical	Not recorded
Area Of Detection	42 m² Manufacturer source The stated detection area is up to 42 square metres. Shelly Presence Gen4 manufacturer product page → Source section Technical details: device description and main features Model Shelly Presence Gen4 Region Manufacturer product page; no universal regional compatibility implied Firmware Not specified by this source Checked 2026-10-04 Coverage is a manufacturer maximum, not a measured result for every room. The page gives conflicting occupant limits in different sections; no exact occupant count is asserted here. Document check only; not a hands-on test or verification of every regional or firmware variant.	Not recorded
Automations	Yes Catalog note 20 schedules, scripting, MQTT, 20 webhooks and local logic on the device, plus Matter occupancy for platform automations.	Yes Catalog note Six adjustable detection levels (1 to 6 m), a configurable presence hold time and a TVOC alert threshold, so presence, illuminance and air quality can all drive automations on the hub.
History Records	Not recorded	Not recorded
Multi Person Detection	Yes Manufacturer source The sensor supports simultaneous detection of multiple occupants. Shelly Presence Gen4 manufacturer product page → Source section Technical details: device description and main features Model Shelly Presence Gen4 Region Manufacturer product page; no universal regional compatibility implied Firmware Not specified by this source Checked 2026-10-04 Coverage is a manufacturer maximum, not a measured result for every room. The page gives conflicting occupant limits in different sections; no exact occupant count is asserted here. Document check only; not a hands-on test or verification of every regional or firmware variant. Catalog note Identifies up to 6 people at once and maps them onto up to 10 customizable detection zones.	No Catalog note Reports a single binary occupancy state, with no person count and no zone or position tracking.
Range Of Detection	8m / 26ft	6m / 19ft
Sleep Monitoring	No	No
Zigbee Router	Not recorded Catalog note USB-C powered and able to join a Zigbee network, but Shelly's knowledge base does not say whether it repeats traffic as a Zigbee router.	Yes Catalog note Mains powered over USB-C and always on, so it also acts as a Zigbee repeater and strengthens the mesh for other devices.
Integrations
Alexa	Yes Catalog note Via Matter. Shelly also lists the Alexa Motion Sensor capability.	Yes Catalog note Works with Echo devices that have a built-in Zigbee hub, including Echo (4th Gen), Echo Plus (1st and 2nd Gen), Echo Studio, Echo Show 8 (3rd Gen), Echo Show 10 (2nd and 3rd Gen), Echo Hub, Eero 6 and Eero Pro 6.
Apple Home	Yes Catalog note Via Matter	Smart Bridge MZ1 required Catalog note Not a HomeKit or Matter endpoint on its own. Apple Home reaches it through Third Reality's Smart Bridge MZ1, the manufacturer's Zigbee to Matter bridge, which the R3 listing names as a supported system.
Google Home	Yes Catalog note Via Matter. Shelly also lists the Google Smart Home Occupancy Sensing trait.	Smart Bridge MZ1 required Catalog note No direct path: Google Home has no Zigbee radio. Third Reality's own Smart Bridge MZ1 republishes its Zigbee devices over Matter, and the manufacturer names the MZ1 as one of the three systems that read this sensor's data.
Home Assistant	Yes Catalog note Via Matter. Shelly's knowledge base also lists Home Assistant as a supported platform, plus local MQTT, webhooks and an embedded web interface.	Yes Catalog note Supported through both ZHA and Zigbee2MQTT. Zigbee2MQTT documents model 3RPL01084Z and exposes occupancy, illuminance, TVOC, the RGB light, presence sensitivity and presence hold time.
Matter	Yes Manufacturer source Matter uses the Wi-Fi connection. Shelly Presence Gen4 manufacturer product page → Source section Technical details: device description and main features Model Shelly Presence Gen4 Region Manufacturer product page; no universal regional compatibility implied Firmware Not specified by this source Checked 2026-10-04 Coverage is a manufacturer maximum, not a measured result for every room. The page gives conflicting occupant limits in different sections; no exact occupant count is asserted here. Document check only; not a hands-on test or verification of every regional or firmware variant. Catalog note Matter over Wi-Fi. CSA certificate CSA25E3FMAT48529-24, certified 2025-11-18, vendor 0x1490 product 0x1821.	No Catalog note A Zigbee 3.0 device. Neither model 3RPL01084Z nor a Third Reality presence sensor appears in the CSA certified products database, and the manufacturer claims no Matter support. Matter platforms reach it only through the separate Smart Bridge MZ1.
SmartThings	Yes Catalog note Via Matter. Shelly also lists the SmartThings Presence Sensor capability.	Yes Catalog note Pairs as a standard Zigbee device with SmartThings (2015/2018) hubs and the Aeotec Smart Home Hub, per the manufacturer's compatibility list.
Power
Wired	Yes Manufacturer source Continuous power is supplied through 5 V USB-C. Shelly Presence Gen4 manufacturer product page → Source section Technical details: device description and main features Model Shelly Presence Gen4 Region Manufacturer product page; no universal regional compatibility implied Firmware Not specified by this source Checked 2026-10-04 Coverage is a manufacturer maximum, not a measured result for every room. The page gives conflicting occupant limits in different sections; no exact occupant count is asserted here. Document check only; not a hands-on test or verification of every regional or firmware variant. Catalog note Powered by USB-C at 5 VDC, 1 A. Nominal consumption 2.5 W, 3.5 W maximum. There is no battery option.	USB-C Catalog note Powered over USB-C at 5V/1A for continuous always-on operation, with no batteries involved.
Sensors
Light	Yes Manufacturer source The light sensor reports dark, twilight and bright states. Shelly Presence Gen4 manufacturer product page → Source section Technical details: device description and main features Model Shelly Presence Gen4 Region Manufacturer product page; no universal regional compatibility implied Firmware Not specified by this source Checked 2026-10-04 Coverage is a manufacturer maximum, not a measured result for every room. The page gives conflicting occupant limits in different sections; no exact occupant count is asserted here. Document check only; not a hands-on test or verification of every regional or firmware variant. Catalog note Built-in light sensor that reports dark, twilight and bright states for lighting-aware automations.	Yes Catalog note Built-in ambient light (Lux) sensor. Zigbee2MQTT exposes illuminance and an illuminance calibration setting.
Presence	Yes Manufacturer source Presence detection uses millimetre-wave radar. Shelly Presence Gen4 manufacturer product page → Source section Technical details: device description and main features Model Shelly Presence Gen4 Region Manufacturer product page; no universal regional compatibility implied Firmware Not specified by this source Checked 2026-10-04 Coverage is a manufacturer maximum, not a measured result for every room. The page gives conflicting occupant limits in different sections; no exact occupant count is asserted here. Document check only; not a hands-on test or verification of every regional or firmware variant. Catalog note 60-64 GHz mmWave radar that detects people who are sitting still, with still detection out to 3 m and tracking of up to 6 people across up to 10 zones.	Yes Catalog note 60 GHz mmWave radar that holds detection on a person who is sitting still, reading the micro-movements of breathing.

Know what’s behind the comparison.

The table matches specifications by section and field. It preserves notes, separates missing data from explicit “No” values, and keeps qualifications attached to their values. No overall winner is assigned from feature counts.

Read our comparison methodology