remote control doorbell (SMC-27)

1. This products is widely used in hallway, gangway of enterprise, hotel, home, supermarket & warehouse, ect.
2. One of the music has designed in Dingdong, double dingdong, 12songs, 16 music.
3. Use DC power, sender use 1pc 23A 12V; Receiver use 2pcs AA batteries; .
4. Remote distance: About 30 meters.
5. Frequency: 433.92MHz.
6. The sender is waterproof.
7. With digital codes to avoid disturb.