Features:
You can install the doorbell in locations, such as kitchen, back yard, or bedroom, never miss the guest
Completely wireless operation - no wires or cables required
Wireless easy mounting design never affects your inner decoration and makes the doorbell anywhere you like
38 tunes selectable and volume control(Hi-Med-Lo)
Wireless system, 80m remote control distance
Doorbell powered by 2 x AA 1.5V batteries(not included)
Remote controller powered by 12V/23A battery(included)

Package included:
1 x Doorbell
1 x Remote controller
2 x Screw
1 x 23A 12V battery