sensor

ThirdReality Motion Sensor

budget local: excellent Zigbee

Price: $19.99 verified Sep 6, 2026
HA fit: good
Works offline: yes
Setup: easy
Hub needed: yes

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Quick verdict

If you want fast, low-cost motion triggers for lighting and hallway automations, the ThirdReality Motion Sensor is a practical Zigbee choice. It is tuned for movement detection (not seated presence), but response is solid and integration with Home Assistant is straightforward.

Standout: Budget Zigbee PIR sensor with dependable trigger speed for lighting automations.

Notes last checked May 31, 2026.

Compatibility snapshot

Home Assistant good

Apple Home none

Google Home none

Alexa none

Works offline yes

Setup easy

Extra hub needed yes

Power battery

Local control facts

Home Assistant: zha integration, Local Polling (home-assistant.io, checked Sep 10, 2026)

Why it stands out

very affordable PIR motion sensor
compact design fits in tight spaces
good Zigbee compatibility with ZHA and Zigbee2MQTT
decent battery life

Reasons to hesitate

PIR has the usual blind spots and cooldown period
no illuminance sensor included
requires a Zigbee coordinator

Best for

budget motion-activated lighting automations
adding occupancy awareness to rooms without spending a lot

Avoid if

you need mmWave-level presence detection for stationary occupancy
you want a combined motion + temperature + lux sensor

Privacy and local-control notes

The sensor uses local Zigbee communication and can run fully offline through your own coordinator. Motion events remain in your local automation stack when used with Home Assistant.

Home Assistant support: supported · integration path: ZHA / Zigbee2MQTT.

Buying reality check

Price notes: About $20 on Amazon (verified 2026-08-28) - no longer a ~$15 pick.

Verified price reads: lowest seen $19.99, latest $19.99 on Sep 6, 2026.

Sep 6, 2026$19.99amazon
Aug 28, 2026$19.99amazon

Compare side by side: see sensor comparisons →

Verified against

The compatibility notes above have not been through the source audit yet. The manufacturer's page is here; the notes were last checked May 31, 2026.

Spotted something wrong? Report an error on this page and I will check it against the source and fix it.

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