If you’re looking for a compact and responsive Zigbee-based presence sensor, the ZG-204ZM is worth a closer look. This small device punches above its weight in both speed and simplicity — especially when used with Zigbee2MQTT.
Zigbee2MQTT Integration
Adding the ZG-204ZM to Zigbee2MQTT (Z2M) is quick and painless. Simply put Z2M into pairing mode, then press and hold the button on the ZG-204ZM for about 3 seconds — the LED on the device will start blinking, indicating that it’s in pairing mode. Within seconds, it should show up in the Zigbee2MQTT interface, typically with entities for presence and battery level.
If you’re using Home Assistant, the device will appear as a binary_sensor and can be used right away in automations and dashboards.
Fast and Accurate Detection
Unlike traditional PIR motion sensors, the ZG-204ZM uses mmWave radar to detect presence. This means it can recognize even small movements — such as someone sitting still — and respond almost instantly. In testing, it detects presence within 1–2 seconds and clears shortly after the room is empty.
It’s perfect for scenarios like:
- Keeping the lights on while someone is working at a desk
- Triggering automation as soon as someone enters a room
- Detecting real presence rather than just motion
Small and Discreet
The ZG-204ZM is impressively small — it runs on two AAA batteries, and the entire unit is just slightly larger than the batteries themselves. That makes it easy to place almost anywhere: mounted on a wall, ceiling, or tucked under a desk. Its minimal size helps it blend into your home without drawing attention.
Final Thoughts
If you want a reliable and discreet presence sensor for your Zigbee network, the ZG-204ZM is a solid choice. It’s easy to add to Zigbee2MQTT, reacts quickly to movement (or stillness), and fits seamlessly into any room. For smart lighting, occupancy-based automation, or energy-saving use cases — this sensor just works.
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