Features:
You can install the doorbells 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
36 tunes selectable
Wireless system, 150m remote control distance
Doorbells powered by 2 x AA batteries(not included)
Remote controller powered by 12V/23A battery(included)
Doorbell size: 10cm x 6.3cm x 3cm
Controller size: 8cm x 4.4cm x 1.5cm

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