Wireless design, easy to install
Multiple music options

Transmitter's battery can last about one year to press the button 20 times every day

*Receiver (installed indoor)
*Transmitter (installed outdoor)
*Select music button

1. Use a small screwdriver to open the transmitter rear cover carefully, install the battery, and then cover it back.
2. Open the receiver battery cover,install two pieces of AAA battery on the receiver and then cover it back (This package does not include any AAA battery ).
3. Test the doorbell.
4. Select music.
5. Fix the transmitter outside the door.
6. Fix the receiver indoors.