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 SwitchSensitivity to light :darkenessProduct model: MR-SK50ALoad power: 40WInput voltage: AC220V 50/60HzInduction sound: 50-70 decibels (within 6 meters)Induction delay: 40 seconds 10 secondsPhotosensitive setting: 10LuxWaterproof rating: IP22Working temperature: -20 ~ 45 CApplication lamps: LED downlights, ceiling lamps, panel lights, bulbs and other lighting fixtures or appliances.size: 38 x 28 x 16mmMaterial: PCcolour: WhitePackage Contents:1 x Sound Sensor SwitchOnly 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.