General description Built-in PIR infrared motion sensor detects motion within 8 meters in dark environments, automatically turning on the LED ceiling light. After 20 seconds of no detected motion, it will turn off to save battery power. The light features two modes: with the photoelectric sensor on, it remains off during the day and lights up at night; with the sensor off, it stays bright all day. Powered by 4 D alkaline batteries (not included), it can illuminate an area of 30 square meters and provides up to 12 months of lighting with an average of 6-8 uses per day. Technical specifications Sensitivity: about 8 meters Sensor range: about 120 degrees Number of LEDs: 80 LEDs Light color: white Delay time: 20 seconds LED life: 50,000 hours Product size: 19 x 19 x 6.5 cm Material: ABS Installation Rotate the back plate of the product clockwise to open. The retainer cap on the rear cover can be easily lifted. Use the included mounting hardware to attach the back plate to the wall,