Sell Direct-Call Audio Door Phone For Apartment WL-02NE

Features:

1) 30s sixteen-chord melody ring, 15s monitor if needed, 120s confidential conversation

2) Three kinds of ring tone available to easily identify different door station

3) Three-level volume adjustable

4) Broadcast calling and intercom function

5) Flush-mount for door station

6) 4 wires polar connection among door station, main monitor and monitor

7) Trigger signal to unlock (workable with various locks)

8) Power supply: adapter plug-in