Features:

(1)One door station can support up to six indoor phones.If needed,it can extend to two door stations support six 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, Color TFT screen 3.5'or 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,remote door unlocking
(9) Room label changeable.
(10) Avoid to unlock by error if no calling.
(11) 3 pieces of connection poles at the rear of the indoor monitor are convenient to link with common electric lock, intelligent electric lock, handle electric lock.3 pieces of pole also can be used to concentrate to supply power.
(12) Unique design to unlock the lock which need a quite big current to unlock.
(13) Prevent to unlock by taking apart the outdoor unit because the outdoor unit has no unlock line. This system unlock by indoor unit.