(1)One door station can support up to four indoor phones.
(2)Audio indoor phones are compatible.
(3)Dual calling, Surveillance, intercom and remote door unlocking are main functions.
(4)B/W or Color TFT screen display, 4' size are available.
(5)LED in the door station provide a clear picture even in night time.
(6)30 seconds ring tones are available, 30 seconds active surveillance, 120 seconds intercom
(7)Double Ding-Dong ring or chord melody rings are available
(8)Handsfree indoor phone;
(9)Avoid to unlock by error if no calling.
(10)Unique design to unlock the door;
(11)Prevent to unlock by taking apart the outdoor unit because the outdoor unit has no unlock line. This system unlock by indoor unit.
(12) Power Source: DC 12V

Spec.:
Chime: Ding dong chime
Ambient temperature: -10 to +40C
Ambient humidity: 45 to 95%