VL-SWD275 Wireless Video Intercom System Main Monitor - 7-inch Wide Screen / WVGA Display. - Display Language: English Arabic. - Hands-free Speaker. Door Camera - Viewing Angle: Horizontal: 85 degrees, Vertical 54 degrees. - Image Sensor: 1.3 Megapixel. - LED Lights: Yes. Other Features - Night Vision: Yes (LED lamps) - Voice Changer: Yes - Intercom: Yes (between main monitor, wireless sub monitor, and extension monitor) - The system supports two door stations and three monitors, up to 6 wireless handsets. - PBX System Compatible Highly Expandable: Up to more additional monitors can be connected to the main monitor using a combination of 7-inch wired monitors and 2.2-inch wireless monitors (however, support for electric gate lock release: The gate or door lock can be easily and quickly released using the monitors (wired or wireless) from anywhere in the house. Image Recording Function: The main monitor and extension monitor can record doorphone images for up to 50 doorphone calls or monitoring sessions. (Up to 4 still images per visitor/session) Night vision with LED lamps (illumination lamp): The door station is equipped with LED lamps (illumination lamp). - There are two units available.