Advantages of wireless musical doorbells
1. It could receive the signal from 30-50 meter.
2. Many songs could be selected.
3. multi-remote devices could control one receiver
4. 530000 different address, avoid interferring each other
character
2, with the flash light, deaf-mute could easy know the doorbell ring.
3, many kinds of music could be selected
4, many remote devices can control one receiver
5, long-distance can be used
6, not interfere each other.
