sensor

ThirdReality Motion Sensor

budget local: excellent Zigbee

Price: $17.99 verified Nov 2, 2026
HA fit: good
Offline: yes
Setup: easy
Hub needed: yes

Check price at Amazon ↗ * View at Third Reality ↗

All environmental and contact sensors → Compare environmental and contact sensors →

Amazon links are affiliate links: as an Amazon Associate I earn from qualifying purchases, at no extra cost to you. Links to makers' own stores and other retailers are plain links that earn me nothing.

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 Oct 26, 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 Oct 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: $19.99 on Amazon and $14.99 for a single pack at Third Reality's own store on October 26, 2026, in stock at both (about $20 on Amazon on 2026-08-28).

Verified price reads: lowest seen $13.99, latest $17.99 on Nov 2, 2026.

Nov 2, 2026$17.99amazon
Oct 30, 2026$19.99amazon
Oct 23, 2026$19.99amazon
Oct 16, 2026$19.99amazon
Oct 13, 2026$13.99amazon
Oct 6, 2026$13.99amazon
Oct 5, 2026$13.99amazon
Oct 4, 2026$13.99amazon

Compare side by side: see sensor comparisons →

What changed for this product

Oct 10, 2026 · Brief

Black Friday smart home deals for Home Assistant: the prices to beat

Black Friday 2026 smart home deals for Home Assistant and local-control homes: the lowest price I've recorded for 100+ Zigbee, Z-Wave, Matter and Wi-Fi devices.

From the change log and the news briefs that name this product.

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 Oct 26, 2026.

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

Buying guide for this category

Still deciding between products? Start with the broader category guide.

Best Zigbee sensors for Home Assistant, plus Z-Wave and other local picks →

Articles that mention this product

Best presence sensors for Home Assistant: mmWave and motion picks

The presence sensors worth buying for Home Assistant: mmWave picks with prices, PIR motion sensors for hallways, and wired sensors room by room.

Read article →

Black Friday smart home deals for Home Assistant: the prices to beat

Black Friday 2026 smart home deals for Home Assistant and local-control homes: the lowest price I've recorded for 100+ Zigbee, Z-Wave, Matter and Wi-Fi devices.

Read article →

Best smart home products under fifty dollars

Top affordable smart home devices for Home Assistant that work locally without cloud dependencies or subscriptions, plus where the radio or hub cost hides.

Read article →