Wireless Battery Powered Door Bell Kit - Extra Loud With Flashing Xenon Light & Volume ControllerExtra Loud - 95 dBAFlashing Xenon LightVolume ControllerSimply plug into suitable mains socket. The socket remains available due to the adaptor.Includes stylish bell push and 3V lithium battery.The Wirefree Doorchime Range has a ‘Learn’ feature and can learn/search for up to 4 transmitters, selecting one of the 4 tunes available. Ideal for homes/offices with several entrances, all transmitters can be set with a different identifying tune.The tune list consists of:Ding DongDing Dong DongDing Dong Ding DongWestminster (8 Notes)The range will always alert you when somebody is at the door. The “no more wires” digital technology means any of the doorchimes may be taken anywhere in the home, garden or mounted on a wall and does not need to be wired to the bell push/transmitter. These doorchimes can also be used with the majority of hardwired bell pushes in conjunction with the DW070AN-C wirefree