THIRDREALITY Presence Sensor R2 24GHz mmWave Radar

THIRDREALITY Presence Sensor R2 is a battery-powered 24GHz mmWave radar motion sensor that detects human presence through non-metallic surfaces and integrates with Zigbee hubs for reliable smart-home automations.

The R2 uses 24 GHz millimeter-wave radar and on-board AI to identify human presence without cameras, providing a privacy-friendly alternative for motion detection. Because it runs on three AA batteries and connects over Zigbee 3.0, the sensor can be mounted almost anywhere and used as a trigger for lights, climate, security, and other automations on platforms like Home Assistant, SmartThings, Homey, and Echo devices with built-in Zigbee hubs.

How does the R2 detect presence through cabinets, glass, or thin walls?

The sensor leverages 24GHz mmWave radar waves that penetrate non-metallic materials like wood and glass, measuring micro-movements and returning stable signals independent of visible light. This enables detection in concealed locations where PIR or camera solutions struggle.

• Penetrates wood, glass, and thin panels for hidden placement.
• Unaffected by ambient light, temperature, or humidity changes.
• Provides privacy because it senses motion, not images or audio.

What integrations and hubs does the sensor support?

The R2 communicates over Zigbee 3.0 and pairs with a wide range of hubs and bridges so it becomes part of your existing smart-home network. It works with Home Assistant (ZHA or Zigbee2MQTT), SmartThings, Aeotec, Homey Bridge/Pro, and Echo devices that include a Zigbee hub.

• Compatible with Echo (4th Gen), Echo Plus, Echo Show 8/10 models with Zigbee.
• Works with Eero 6 and Eero Pro 6 routers that include Zigbee hubs.
• Integrates into automations: lights, thermostats, cameras, and notifications.

How adjustable and reliable is detection in real homes?

The sensor includes AI-enhanced environment learning and five sensitivity levels to tailor detection to different rooms and scenarios. This reduces false triggers from gentle environmental motion—like small curtain movement—while still allowing high-sensitivity monitoring when needed.

• Five user-selectable sensitivity settings for fine tuning.
• AI learning filters routine environmental noise to cut false alerts.
• Note: strong repetitive motions (fans, heavy drafts) may still activate the sensor.

How easy is installation and power management?

R2 runs on three standard AA batteries, eliminating the need for wiring or an outlet and enabling discreet installation inside cabinets, on walls, or in ceilings. Battery operation plus low-power Zigbee communication delivers long service life when configured with normal activity and polling intervals.

• Battery-powered — installs anywhere without tools or wiring.
• Low-power Zigbee 3.0 for efficient network communication.
• Mounting options include adhesive or screws for flexible placement.

Who is this for? The THIRDREALITY Presence Sensor R2 is ideal for smart-home users who want privacy-respecting presence detection in locations where cameras or PIR sensors aren’t practical—such as closets, bathrooms, cabinets, or behind glass. It suits hobbyists and integrators running Home Assistant, SmartThings, Homey, or Amazon Echo ecosystems who need a compact, battery-powered Zigbee trigger with adjustable sensitivity and reliable detection through non-metallic barriers.