video door phone product : VIDEO INDOOR PHONE Model : CS-300SV-5 CRT/LCD 4"FlatTube 4" Color TFT LCD Power source DC15V/AC100 - 240V Power consumption 10W Resolution 380TVL 960(W) X 280(H) Operating temperature -10 ~ +50 Wiring 4wires/2wires Installation wall mount Material : plastic Picture memory yes Function : one door station can up to four indoor phone surveillance intercom remote unlocking B/W or color are available LED in the door station providr a clear picture in the night connect with 4 wires or 2 wires picture memory ( choice) alarm deterrent