This is a multi-functional device. It is not only a wireless doorbell but also a security burglar alarm, a motion sensor light, an emergency light, a calling buzzer. Batteries Powered, No wires and no electrician is needed Receiver is powered by 3 AA batteries(not included), remote transmitter button is powered by one 12V/23A battery(included). Individualize Your Doorbell Ring Tune There are 36 chime tones with 3 levels of adjustable volume. You can choose your favorite one to set as doorbell ring tune. Strong Signal, Long Operating Distance The signal can easily penetrate walls batteries, and the wireless operating range can be over 100m. Simple Installation Comes with double-side adhesive tapes and anchors and screws, a hanging buckle. You can stick them to walls or fixed them on walls.

• Remote transmitter Button Power Source: one 12V 23A battery(included)
• Frequency: 433.92MHZ
• Doorbell Ringtones: 36 chimes
• LED Quantity: 5pcs
• Operating Range: 100m

Remote transmitter Button Power Source: one 12V 23A battery(included)Victsing