Xiaomi light sensor

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Model number: gzcgq01lm
Product size: 41 × 41 × 15mm
Wireless connection: Zigbee 3.0
Sensitivity range:  0 ~ 83000 lux
Battery model: CR2450
Operating temperature: -10 ℃ to -50 ℃  0% -95% RH

This light sensor will measure the light intensity from 0 to 83000 lux. The range is adequate to measure full darkness (0 lux), sunset/sunrise (40-400 lux), overcast daytime (1000-2000 lux), and a sunny day (110000 lux). In the sensor are two magnets so you can stick it to any metal surface.
Because this sensor uses the zigbee 3.0 protocol it will only work on the newer Mi home hubs like the ZNDMWG03LM.

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