Shelly Blu Motion vs Shelly BLU Motion ZB

The Shelly BLU Motion ZB for a Zigbee home, because it adds a Zigbee 3.0 radio that runs at the same time as its Bluetooth and is the better reviewed of the two. The Shelly Blu Motion is the pick if you want the numeric lux reading from its light sensor, which the newer model replaced with three coarse levels.

The radios and the light sensor. The Shelly Blu Motion is Bluetooth only and reports a lux value, while the Shelly BLU Motion ZB adds Zigbee 3.0 alongside Bluetooth but reports only dark, twilight and bright instead of a number.

Yes. The Shelly Blu Motion needs a Shelly gateway such as a BLU Gateway or a Shelly Plus, Pro or Gen3 device to bridge Bluetooth to Wi-Fi. The Shelly BLU Motion ZB joins an existing Zigbee 3.0 coordinator, or uses a Shelly Bluetooth gateway for its Bluetooth side. Neither is standalone.

The Shelly Blu Motion, which has an integrated lux sensor, though it updates only when motion is detected to save battery. The Shelly BLU Motion ZB reports three coarse levels, dark, twilight and bright, with configurable thresholds at 50 lx and 500 lx by default.

Both do. The Shelly Blu Motion is read over BTHome through a Shelly bridge, and the Shelly BLU Motion ZB is supported by Zigbee2MQTT for this exact model, exposing occupancy, battery, light level and motion sensitivity, while also broadcasting BTHome.

Existing Shelly households that want a tiny, fast indoor sensor with a lux reading for dark-only lighting triggers, and that already own a Shelly bridge device.

Zigbee homes and Shelly users who want the same small sensor to join a Zigbee coordinator and broadcast BTHome at once, with three sensitivity levels and a tunable hold time, and who do not need a lux number.