This sensor is in dormant state when in lighting environment, for example in daytime. Can be controlled by any sound and it will working In the dark environment, for example in night. If the sensor feel sound, the controlled lamp will be light about 45s. Automatic control, save energy. Used in corridor, bathroom, warehouse, stair etc. Specification: Product Name: Sound Sensor Switch Sensitivity to light :darkeness Product model: MR-SK50A Load power: ≤40W Input voltage: AC180-265V 50/60Hz Induction sound: 50-70 decibels (within 6 meters) Induction delay: 40 seconds ± 10 seconds Photosensitive setting: ≤10Lux Waterproof rating: IP22 Working temperature: -20 ~ 45 ° C Product size: length 38mm × width 28mm × height 16mm Packing quantity: 1000 / box Application lamps: LED downlights, ceiling lamps, panel lights, bulbs and other lighting fixtures or appliances. Specifications: Product Name: Sound Sensor Switch Sensitivity to light :darkeness Product model: MR-SK50A Load power: ≤40W Input voltage: AC180-265V 50/60Hz Induction sound: 50-70 decibels (within 6 meters) Induction delay: 40 seconds ± 10 seconds Photosensitive setting: ≤10Lux Waterproof rating: IP22 Working temperature: -20 ~ 45 ° C Product size: length 38mm × width 28mm × height 16mm