The Smart Device Compare comparison

Shelly Presence Gen4 vs Third Reality Smart Presence Sensor R2

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 R2

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 R2 — No.
Bluetooth (connectivity): Shelly Presence Gen4 — Yes (Bluetooth 5 LE for onboarding.); Third Reality Smart Presence Sensor R2 — 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 R2 — No (Reports a single binary occupancy state, with no person count or zone tracking.).
Apple Home (integrations): Shelly Presence Gen4 — Yes (Via Matter); Third Reality Smart Presence Sensor R2 — No.

Specifications to check side by side

Range Of Detection (features): Shelly Presence Gen4 — 8m / 26ft; Third Reality Smart Presence Sensor R2 — 5m / 16ft.

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 R2

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.

9differences 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 R2No

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 R2No

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 R2: 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 R2: Yes
Catalog note
Presence and absence can trigger lights, thermostats, curtains, security cameras or a phone notification in a compatible smart home system.

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 R2: No

5 GHz Wi-Fi

Shelly Presence Gen4: No
Third Reality Smart Presence Sensor R2: 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 R2

Thread

Shelly Presence Gen4: No
Third Reality Smart Presence Sensor R2: No

Z Wave

Shelly Presence Gen4: No
Third Reality Smart Presence Sensor R2: 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 R2: Zigbee Hub required
Catalog note
Zigbee 3.0 end device. A compatible Zigbee hub or coordinator is required: Home Assistant (ZHA or Zigbee2MQTT), SmartThings, Aeotec, Homey, Hubitat, and Echo devices with a built-in Zigbee hub.

Features

Angle Of Detection

Shelly Presence Gen4: 140° Horizontal / 120° Vertical
Third Reality Smart Presence Sensor R2: 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 R2

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 R2: Yes
Catalog note
Five adjustable sensitivity levels plus AI-enhanced environment learning to cut false triggers from airflow or moving curtains.

History Records

Shelly Presence Gen4: Not recorded
Third Reality Smart Presence Sensor R2: 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 R2

Catalog note

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

Range Of Detection

Shelly Presence Gen4: 8m / 26ft
Third Reality Smart Presence Sensor R2: 5m / 16ft

Sleep Monitoring

Shelly Presence Gen4: No
Third Reality Smart Presence Sensor R2: 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 R2: No
Catalog note
Battery-powered Zigbee end device, so it does not repeat traffic 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 R2: 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 R2: No

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 R2: No

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 R2: Yes
Catalog note
Supported through both ZHA and Zigbee2MQTT. Zigbee2MQTT documents model 3RPS01083Z and exposes battery, occupancy, sensor calibration and sensor sensitivity.

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 R2

Catalog note

A Zigbee 3.0 device. Model 3RPS01083Z returns no result in the CSA certified products database and the manufacturer does not claim Matter support.

SmartThings

Shelly Presence Gen4: Yes
Catalog note
Via Matter. Shelly also lists the SmartThings Presence Sensor capability.
Third Reality Smart Presence Sensor R2: Yes
Catalog note
Listed by the manufacturer as compatible with SmartThings (2015/2018 hubs) and the Aeotec Smart Home Hub.

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 R2

Catalog note

Powered by three standard AA batteries (included), rated for up to 3 years in typical usage, so it needs no outlet or wiring.

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 R2

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 R2

Yes

Catalog note

24 GHz mmWave radar that detects stationary people and micro-motion, and reads through non-metallic materials such as wood and glass.

Specifications for Shelly Presence Gen4 versus Third Reality Smart Presence Sensor R2
Specification	Shelly Presence Gen4	Third Reality Smart Presence Sensor R2
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, thermostats, curtains, security cameras or a phone notification in a compatible smart home system.
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. A compatible Zigbee hub or coordinator is required: Home Assistant (ZHA or Zigbee2MQTT), SmartThings, Aeotec, Homey, Hubitat, and Echo devices 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 Five adjustable sensitivity levels plus AI-enhanced environment learning to cut false triggers from airflow or moving curtains.
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 or zone tracking.
Range Of Detection	8m / 26ft	5m / 16ft
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.	No Catalog note Battery-powered Zigbee end device, so it does not repeat traffic 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	No
Google Home	Yes Catalog note Via Matter. Shelly also lists the Google Smart Home Occupancy Sensing trait.	No
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 3RPS01083Z and exposes battery, occupancy, sensor calibration and sensor sensitivity.
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. Model 3RPS01083Z returns no result in the CSA certified products database and the manufacturer does not claim Matter support.
SmartThings	Yes Catalog note Via Matter. Shelly also lists the SmartThings Presence Sensor capability.	Yes Catalog note Listed by the manufacturer as compatible with SmartThings (2015/2018 hubs) and the Aeotec Smart Home Hub.
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.	No Catalog note Powered by three standard AA batteries (included), rated for up to 3 years in typical usage, so it needs no outlet or wiring.
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.	No
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 24 GHz mmWave radar that detects stationary people and micro-motion, and reads through non-metallic materials such as wood and glass.

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