Features: High sensitivity, stable performances and durability. Used in corridors, bathrooms, warehouses, stairs, etc. The sensors is in a dormant state under light conditions, such as during the day. If the sensors has a sound, the control light will be on for about 45s. It can be controlled by any sound, and it can work in a dark environment, such as at night. When the surrounding environment is bright and there is a loud sound, it will not light up. The light will only turn on when the surroundings are dark and there is a sound. Specifications: Material: ABS Style: with Light / Without Light Size: Approx. 86x86mm/3.38x3.38inch Delay Closing Time: 45s Working Voltage: 220v Induction Principle: Sound and Light Control Package Includes: 1x Switch with Light / Switch Without Light note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.