Features:
1) 30s sixteen-chord melody ring, 120s confidential conversation
2) Two rings for option, but one door station can only have one ring
3) 3-level volume adjustable
4) Intercom functions, the indoor phones can have a inner-calling between each other
5) Flush-mount for door station
6) 4 wire polar connection among door station, main monitor and monitor
7) Trigger signal to unlock (workable with various locks)
8) Power supply: adapter plug-in
9) Dimensions:
a) Door station: WL-06Nd2 164 x 126 x 42mm
b) Indoor phone: WL-06NFaH 216 x 94 x 59mm