MondpalastBLUE WIRELESS DOOR BELL HOME CORDLESS PORTABLE 36 CHIME 100M RANGE DIGITAL DOORBELL Energy saving and the battery inside the button can last up to for one year (20 presses per day) 36 melody music for you to choose LED indicator flashes when bell rings Press the remote control button to trigger the wireless receiver doorbell to chime. Powered by 2 x AA battery (not included) for the receiver; and 1 x 12V 23A battery (included) for the remote button.