[No Batteries Needed] Wireless Doorbell, Waterproof Doorbell Electronic Chime Kit with 2 Plug-in Receivers, 200M Range, 52 Melodies at 4 Volume Levels for Home, Office, Hotel

No Batteries Required: Our wireless doorbell transmitter uses unique PUSH-RF technology. When you press the button, the kinetic energy is converted into an electrical signal that rings your doorbell wirelessly. No more worrying about batteries. More convenient, more energy-efficient, and more practical than the old one.