a) One or two door stations can support up to four indoor phones.
b) Hands-free indoor phone, remote door unlocking/releasing.
c) LED in the door station provides a perfect night vision.
d) 30 seconds ring tones are available, 30 seconds surveillance, 120 seconds intercom.
e) Double Ding-Dong ring or chord melody ring is optional.
f) Pin-hole camera. Indoor phone color 3.5' TFT display.
g) Heavy duty anti-vandal and weatherproof door station.