1、Wireless transmission and reception, easy to install, does not destroy the aesthetic effect of the room decoration. 2、The remote control distance of 20-30 (open space) meters (used at home for about 15 meters due to signal interference) meets the needs of various residential and high-rise buildings. 3、The transmitter part can be fixed at the door with double-sided tape to prevent rain from dripping. 4、No power consumption when static, the battery can be used for one year. 5、The receiver is powered by 2 AA batteries and is easy to replace. Features: Wireless transmission and reception, easy to install, does not destroy the aesthetic effect of the room decoration. The remote control distance of 20-30 (open space) meters (used at home for about 15 meters due to signal interference) meets the needs of various residential and high-rise buildings. The transmitter part can be fixed at the door with double-sided tape to prevent rain from dripping. No power consumption when static, the battery can be used for one year. The receiver is powered by 2 AA batteries and is easy to replace. Specifications: Condition: Brand New Color: Shown as Picture Material: ABS Receiver Power Supply: 2 * AA Battery (Not Included) Transmitter Voltage: 1 * 23 A Battery (Included) Package List: 1* Receiver 1* Transmitter 1* Battery 1* Double Sided Sticker Note:Please note that the product color is shipped randomly.