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 about 45s. Fine workmanship and stable performance. Automatic control, save energy. High sensitivity, practicability. Durable in use. Used in corridor, bathroom, warehouse, stair etc. Specifications: Product Name: Sound Sensor Switch Sensitivity to light :darkeness Product model: MR-SK50A Load power: 40W Input voltage: AC220V 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 Application lamps: LED downlights, ceiling lamps, panel lights, bulbs and other lighting fixtures or appliances. size: 38 x 28 x 16mm Material: PC colour: White Package Contents: 2 x Sound Sensor Switch Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.