Linbell G2 is a wireless doorbell which works without battery. It's self-powered as anyone touch the launcher. More environmentally friendly and cheaper that other wireless doorbells on the market.
Linbell includes launchers and receivers. You can add the launchers into 2 or the receivers into 2/3/4 according to your needs.
The plug type of receiver is EU,US and UK. For other countries, an adapter is a must-be.
Linbell Self-Powered Doorbell is a creative plug-in wireless doorbell, which is easy to install, requires no wiring and no battery replacement. G4 is more progressive than G2 for the smaller receiver size, adjustable volume and door identify via ringtone, as well as power off memory.