Wireless Chime Doorbell Door Chime 5-level volume adjustment 60 melodies selectable 300m communication range For example, you can ring the chime from the entrance of a wooden house to a room on the 2nd floor. Confirmed at my home. Also for offices and stores. Button battery is CR2032: Can be removed by sliding it sideways. See photo. The receiver is used by plugging it into an outlet. When tested, the melody resets to a normal "ding-dong" sound when the power is turned off. The song selection button and volume button are on the side of the receiver. No setup required, ready to use. 6/3 Items for sale - Set of transmitter and receiver (with button battery): Color is black - Thick double-sided tape - English manual - Sticker (Ring Bell) - Included screws (Not used in general. There are no screw holes in the transmitter)