The Smart Device Compare comparison

Ring Window and Door Contact Sensor (2nd gen) vs Shelly BLU Door/Window ZB

Understand the differences. Decide what matters to your home.

Before you compare every specification

Key differences between Ring Window and Door Contact Sensor (2nd gen) and Shelly BLU Door/Window ZB

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

Feature differences among your selected devices

Tamper Alerts (alerts): Ring Window and Door Contact Sensor (2nd gen) — Yes (Ring documents resolving a tampered Contact Sensor (1st and 2nd Gens): the tamper switch sounds the Alarm siren and shows the Tampered indicator in the app); Shelly BLU Door/Window ZB — No (The documented IAS Zone status flags are Alarm1, Alarm2 and Battery only, with no tamper bit.).
Bluetooth (connectivity): Ring Window and Door Contact Sensor (2nd gen) — No; Shelly BLU Door/Window ZB — Yes (Bluetooth 5 (LE), broadcasting in the BTHome format, with simultaneous Zigbee + Bluetooth operation.).
Light (sensors): Ring Window and Door Contact Sensor (2nd gen) — No; Shelly BLU Door/Window ZB — Yes (Built-in light sensor reporting illumination, with configurable dark and bright thresholds.).

Specifications to check side by side

Z Wave (connectivity): Ring Window and Door Contact Sensor (2nd gen) — Z-Wave Hub required; Shelly BLU Door/Window ZB — No.
Zigbee (connectivity): Ring Window and Door Contact Sensor (2nd gen) — No; Shelly BLU Door/Window ZB — Zigbee Hub required (Zigbee 3.0 end device (IAS Zone, profile 0x104), so it joins an existing Zigbee coordinator.).
Alexa (integrations): Ring Window and Door Contact Sensor (2nd gen) — Yes; Shelly BLU Door/Window ZB — Shelly gateway required (Reaches Amazon Alexa through the Shelly Smart Control account, and the product page states a gateway is necessary to use this device with that app (Shelly BLU Gateway, or any Shelly Plus, Pro, Gen3 or Gen4 device other than a sensor).).
Google Home (integrations): Ring Window and Door Contact Sensor (2nd gen) — No; Shelly BLU Door/Window ZB — Shelly gateway required (Reaches Google Home through the Shelly Smart Control account, and the product page states a gateway is necessary to use this device with that app (Shelly BLU Gateway, or any Shelly Plus, Pro, Gen3 or Gen4 device other than a sensor).).

Information still to confirm

6 of 30 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 · Ring

Ring Window and Door Contact Sensor (2nd gen)

Last updated October 2026

View full device profile

Option 2 · Shelly

Shelly BLU Door/Window ZB

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.

10differences with recorded values for every device

6rows with missing or unspecified information

Consider your setup

Battery Life

Ring Window and Door Contact Sensor (2nd gen)3 years
Shelly BLU Door/Window ZB5 years

Compare the stated test conditions. Catalog battery figures alone do not predict runtime in your home.

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 30 of 30 rows. “Not recorded” does not mean “No”.

Reading layout

Alerts

Door Window Alerts

Ring Window and Door Contact Sensor (2nd gen): Yes
Shelly BLU Door/Window ZB: Yes

Low Battery Alerts

Ring Window and Door Contact Sensor (2nd gen): Not recorded
Shelly BLU Door/Window ZB: Yes
Catalog note
IAS Zone status bit 3 flags a battery at or below 15 percent, and the battery percentage is also broadcast over BTHome.

Motion Alerts

Ring Window and Door Contact Sensor (2nd gen): No
Shelly BLU Door/Window ZB: No

Tamper Alerts

Ring Window and Door Contact Sensor (2nd gen): Yes
Catalog note
Ring documents resolving a tampered Contact Sensor (1st and 2nd Gens): the tamper switch sounds the Alarm siren and shows the Tampered indicator in the app
Shelly BLU Door/Window ZB: No
Catalog note
The documented IAS Zone status flags are Alarm1, Alarm2 and Battery only, with no tamper bit.

Temperature Alerts

Ring Window and Door Contact Sensor (2nd gen): No
Shelly BLU Door/Window ZB: No

Connectivity

2.4 GHz Wi-Fi

Ring Window and Door Contact Sensor (2nd gen): No
Shelly BLU Door/Window ZB: No

5 GHz Wi-Fi

Ring Window and Door Contact Sensor (2nd gen): No
Shelly BLU Door/Window ZB: No

Bluetooth

Ring Window and Door Contact Sensor (2nd gen): No
Shelly BLU Door/Window ZB: Yes
Catalog note
Bluetooth 5 (LE), broadcasting in the BTHome format, with simultaneous Zigbee + Bluetooth operation.

Other

Ring Window and Door Contact Sensor (2nd gen): No
Shelly BLU Door/Window ZB: No

Thread

Ring Window and Door Contact Sensor (2nd gen): No
Shelly BLU Door/Window ZB: No

Z Wave

Ring Window and Door Contact Sensor (2nd gen): Z-Wave Hub required
Shelly BLU Door/Window ZB: No

Zigbee

Ring Window and Door Contact Sensor (2nd gen): No
Shelly BLU Door/Window ZB: Zigbee Hub required
Catalog note
Zigbee 3.0 end device (IAS Zone, profile 0x104), so it joins an existing Zigbee coordinator.

Features

Automations

Ring Window and Door Contact Sensor (2nd gen): Not recorded
Shelly BLU Door/Window ZB: Yes
Catalog note
Open and close events trigger scenes and automations, either directly with other Shelly devices or through the Shelly Smart Control app.

History Records

Ring Window and Door Contact Sensor (2nd gen): Not recorded
Shelly BLU Door/Window ZB: Not recorded

Minimum Detection Distance

Ring Window and Door Contact Sensor (2nd gen): Not recorded
Shelly BLU Door/Window ZB: 10mm

Ota

Ring Window and Door Contact Sensor (2nd gen): Not recorded
Shelly BLU Door/Window ZB: Yes
Catalog note
Firmware is updated over the air from the Shelly Smart Control app once the device is registered in the account, or from the Shelly BLE Debug app.

Sensitivity

Ring Window and Door Contact Sensor (2nd gen): Not recorded
Shelly BLU Door/Window ZB: Yes
Catalog note
Report angle threshold is configurable from 0 to 90 degrees (1 degree by default) and sets the minimum tilt needed to trigger a report; the light sensor adds configurable dark and bright thresholds.

Integrations

Alexa

Ring Window and Door Contact Sensor (2nd gen): Yes
Shelly BLU Door/Window ZB: Shelly gateway required
Catalog note
Reaches Amazon Alexa through the Shelly Smart Control account, and the product page states a gateway is necessary to use this device with that app (Shelly BLU Gateway, or any Shelly Plus, Pro, Gen3 or Gen4 device other than a sensor).

Apple Home

Ring Window and Door Contact Sensor (2nd gen): No
Shelly BLU Door/Window ZB: No
Catalog note
The device documentation lists only Bluetooth (BTHome) and Zigbee, with no Matter or HomeKit profile, and Shelly does not offer an Apple Home path for its BLU sensors.

Google Home

Ring Window and Door Contact Sensor (2nd gen): No
Shelly BLU Door/Window ZB: Shelly gateway required
Catalog note
Reaches Google Home through the Shelly Smart Control account, and the product page states a gateway is necessary to use this device with that app (Shelly BLU Gateway, or any Shelly Plus, Pro, Gen3 or Gen4 device other than a sensor).

Home Assistant

Ring Window and Door Contact Sensor (2nd gen): Yes
Shelly BLU Door/Window ZB: Yes
Catalog note
Zigbee2MQTT supports this exact model (SBDW-103C), exposing contact, handle position, battery, battery low and light level.

Matter

Ring Window and Door Contact Sensor (2nd gen): No
Shelly BLU Door/Window ZB: No
Catalog note
Not in the CSA certified-product database, and the device documentation lists only Bluetooth 5 LE and Zigbee 3.0.

SmartThings

Ring Window and Door Contact Sensor (2nd gen): No
Shelly BLU Door/Window ZB: Shelly gateway required
Catalog note
Reaches SmartThings through the Shelly Smart Control account, and the product page states a gateway is necessary to use this device with that app (Shelly BLU Gateway, or any Shelly Plus, Pro, Gen3 or Gen4 device other than a sensor).

Power

Battery Life

Ring Window and Door Contact Sensor (2nd gen): 3 years
Shelly BLU Door/Window ZB: 5 years

Battery Type

Ring Window and Door Contact Sensor (2nd gen): 2x CR2032
Shelly BLU Door/Window ZB: 1x CR2032

Sensors

Door Window

Ring Window and Door Contact Sensor (2nd gen): Yes
Shelly BLU Door/Window ZB: Yes
Catalog note
Reed switch, reported over Zigbee as IAS Zone type 0x0016 (Door/Window Handle), which also distinguishes tilted from fully open.

Light

Ring Window and Door Contact Sensor (2nd gen): No
Shelly BLU Door/Window ZB: Yes
Catalog note
Built-in light sensor reporting illumination, with configurable dark and bright thresholds.

Motion

Ring Window and Door Contact Sensor (2nd gen): No
Shelly BLU Door/Window ZB: No
Catalog note
The MSA311 accelerometer measures the tilt angle of the door or window, not movement in the room.

Occupancy

Ring Window and Door Contact Sensor (2nd gen): No
Shelly BLU Door/Window ZB: No

Temperature

Ring Window and Door Contact Sensor (2nd gen): No
Shelly BLU Door/Window ZB: No

Specifications for Ring Window and Door Contact Sensor (2nd gen) versus Shelly BLU Door/Window ZB
Specification	Ring Window and Door Contact Sensor (2nd gen)	Shelly BLU Door/Window ZB
Alerts
Door Window Alerts	Yes	Yes
Low Battery Alerts	Not recorded	Yes Catalog note IAS Zone status bit 3 flags a battery at or below 15 percent, and the battery percentage is also broadcast over BTHome.
Motion Alerts	No	No
Tamper Alerts	Yes Catalog note Ring documents resolving a tampered Contact Sensor (1st and 2nd Gens): the tamper switch sounds the Alarm siren and shows the Tampered indicator in the app	No Catalog note The documented IAS Zone status flags are Alarm1, Alarm2 and Battery only, with no tamper bit.
Temperature Alerts	No	No
Connectivity
2.4 GHz Wi-Fi	No	No
5 GHz Wi-Fi	No	No
Bluetooth	No	Yes Catalog note Bluetooth 5 (LE), broadcasting in the BTHome format, with simultaneous Zigbee + Bluetooth operation.
Other	No	No
Thread	No	No
Z Wave	Z-Wave Hub required	No
Zigbee	No	Zigbee Hub required Catalog note Zigbee 3.0 end device (IAS Zone, profile 0x104), so it joins an existing Zigbee coordinator.
Features
Automations	Not recorded	Yes Catalog note Open and close events trigger scenes and automations, either directly with other Shelly devices or through the Shelly Smart Control app.
History Records	Not recorded	Not recorded
Minimum Detection Distance	Not recorded	10mm
Ota	Not recorded	Yes Catalog note Firmware is updated over the air from the Shelly Smart Control app once the device is registered in the account, or from the Shelly BLE Debug app.
Sensitivity	Not recorded	Yes Catalog note Report angle threshold is configurable from 0 to 90 degrees (1 degree by default) and sets the minimum tilt needed to trigger a report; the light sensor adds configurable dark and bright thresholds.
Integrations
Alexa	Yes	Shelly gateway required Catalog note Reaches Amazon Alexa through the Shelly Smart Control account, and the product page states a gateway is necessary to use this device with that app (Shelly BLU Gateway, or any Shelly Plus, Pro, Gen3 or Gen4 device other than a sensor).
Apple Home	No	No Catalog note The device documentation lists only Bluetooth (BTHome) and Zigbee, with no Matter or HomeKit profile, and Shelly does not offer an Apple Home path for its BLU sensors.
Google Home	No	Shelly gateway required Catalog note Reaches Google Home through the Shelly Smart Control account, and the product page states a gateway is necessary to use this device with that app (Shelly BLU Gateway, or any Shelly Plus, Pro, Gen3 or Gen4 device other than a sensor).
Home Assistant	Yes	Yes Catalog note Zigbee2MQTT supports this exact model (SBDW-103C), exposing contact, handle position, battery, battery low and light level.
Matter	No	No Catalog note Not in the CSA certified-product database, and the device documentation lists only Bluetooth 5 LE and Zigbee 3.0.
SmartThings	No	Shelly gateway required Catalog note Reaches SmartThings through the Shelly Smart Control account, and the product page states a gateway is necessary to use this device with that app (Shelly BLU Gateway, or any Shelly Plus, Pro, Gen3 or Gen4 device other than a sensor).
Power
Battery Life	3 years	5 years
Battery Type	2x CR2032	1x CR2032
Sensors
Door Window	Yes	Yes Catalog note Reed switch, reported over Zigbee as IAS Zone type 0x0016 (Door/Window Handle), which also distinguishes tilted from fully open.
Light	No	Yes Catalog note Built-in light sensor reporting illumination, with configurable dark and bright thresholds.
Motion	No	No Catalog note The MSA311 accelerometer measures the tilt angle of the door or window, not movement in the room.
Occupancy	No	No
Temperature	No	No

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