# ThirdReality Smart Presence Sensor R2

*ThirdReality / R2*

> The Smart Presence Sensor R2 detects presence with a 24 GHz mmWave radar, so it works without a camera. It is a battery-powered Zigbee 3.0 sensor with five adjustable sensitivity levels and three AA batteries. It suits Alexa users, with native support through Zigbee. SmartThings and Home Assistant users reach it through an integration (Zigbee).

- Canonical page: https://smarthomecanon.com/devices/thirdreality-smart-presence-sensor-r2
- Last checked: 2026-10-20

## Key facts

| Fact | Value |
| --- | --- |
| Brand | [ThirdReality](https://smarthomecanon.com/brands/thirdreality) |
| Category | Presence sensor |
| Model numbers | R2 |
| Status | Current[^1] |
| Type | Presence[^1] |
| Radio | Zigbee 3.0[^1] |
| Power | 3 AA batteries[^1] |
| Hub needed | Zigbee hub required[^1] |

## Integration paths

**How the ThirdReality Smart Presence Sensor R2 connects**

| Path | Requires | Local | Features lost |
| --- | --- | --- | --- |
| [Zigbee](https://smarthomecanon.com/protocols/zigbee) | A Zigbee hub or an Echo device with a built-in Zigbee hub[^1] | unknown | unknown |

**Platform support for the ThirdReality Smart Presence Sensor R2**

| Path | Platform | Support | Integration |
| --- | --- | --- | --- |
| Zigbee | [Amazon Alexa](https://smarthomecanon.com/platforms/alexa) | Native[^1] |  |
| Zigbee | [Home Assistant](https://smarthomecanon.com/platforms/home-assistant) | Via integration[^1] | ZHA or Zigbee2MQTT |
| Zigbee | [Samsung SmartThings](https://smarthomecanon.com/platforms/smartthings) | Via integration[^1] |  |
| Zigbee | [Hubitat Elevation](https://smarthomecanon.com/platforms/hubitat) | Via integration[^1] |  |
| Zigbee | [Homey](https://smarthomecanon.com/platforms/homey) | Via integration[^1] |  |

## Related pages

- [ThirdReality Zigbee sensors](https://smarthomecanon.com/lines/thirdreality-zigbee-sensors) (line)
- [ThirdReality](https://smarthomecanon.com/brands/thirdreality) (brand)
- [Zigbee](https://smarthomecanon.com/protocols/zigbee) (protocol)
- [Amazon Alexa](https://smarthomecanon.com/platforms/alexa) (platform)
- [Home Assistant](https://smarthomecanon.com/platforms/home-assistant) (platform)
- [Samsung SmartThings](https://smarthomecanon.com/platforms/smartthings) (platform)
- [Hubitat Elevation](https://smarthomecanon.com/platforms/hubitat) (platform)
- [Homey](https://smarthomecanon.com/platforms/homey) (platform)

## Sources

[^1]: Smart Presence Sensor R2 - ThirdReality store. https://www.thirdreality.com/products/smart-presence-sensor-r2 (manufacturer, checked 2026-10-12)