Model of the Mi Light Detection Sensor: YTC4043GL Mi Light Detection Sensor: This light sensor is used in smart homes to automatically turn on lights such as orientation lights. Zigbee 3.0 protocol; range: 0 to 83,000 Lux; gateway from Xiaomi Smart Set or Mi Home Hub compatible. CR2450 battery. Range of detection: 0–83,000 Lux. Measurements: 40 by 40 by 12 mm. Category: Cameras | Home Security | Xiaomi SKU: 69341-777086