MAKE LIFE EASIER: DEWENWILS remote control switch can remotely turn on/off garden lights, light strings, fountain pumps, sprinklers, lighting fixtures and other electrical appliances with one button. Plug and play, save your time( CR2032 3V battery included). STRONG RF SIGNAL: This wireless remote outlet works through walls and doors without any interference, up to 100 feet range in open areas, does not require line of sight between the remote controller and receiver; The remote controller comes with a key ring, easy to store NON-INTERFERENCE & HASSLE-FREE: Unique advanced technology eliminates self-interference or interference with other existing RF remote control system; no need to worry about duplicate frequency problem or affecting your neighbors lights; effortlessly control the household appliances from your home inside or outside without interference PROGRAMMABLE & EXPANDABLE: This remote outlet switch has been pre-programmed for immediate use, but you can freely add extra