Detailed Description  Name: B/W Video DoorPhone for Villa  Model: PST-VD903B  Standard package includes: One indoor monitor, One outdoor station, one adapter, one English user manual and one cable. Description 4-inch color TFT/4-inch B&W CRT Working voltage: DC15V CMOS camera, 380 TV lines, 6pcs IR LEDs (CCD camera is optional and extra charge) Function: monitor, talk, unlock, and internal lines calling Hot function: one outdoor station can support four indoor monitor; and one indoor monitor can support two outdoor station;