This 21" Dual Page - 8 Channel Color Quad Observation Monitor views up to 8 locations simultaneously in multiple viewing options such as Full Screen, Quad Screen, PIP (Picture-in-Picture), Non-Realtime 8 Split Mode and Auto Sequence. Choice of display is selected from the main control panel on the front of the unit. Constructed within a durable metal cabinet, this monitor includes eight (4-in1) camera inputs (Video, Audio, Power, Intercom), one RCA composite video input for video playback and one RCA composite video output for recording to a VCR/DVR, One RCA Audio input and one RCA Audio Output. Also includes Motion and Video Loss detection with an alarm output. This monitor is multi-voltage compatible, runs on 100 to 240-volts of power and achieves 450 TVL (TV lines) of resolution at up to 30 frames per second High Quality Monitor Connect up to 8 Cameras Power Supply to Camera 2-Way Audio Communication (Intercom) Zoom Function Menu Control Alarm Relay Output Multiple Screen Displays: Full, Quad, PIP, 8 Split Mode, Auto Sequence Adjustable Brightness, Contrast, Saturation, Hue and Sharpness Built-in Real Time Clock Screen Overlay Information: Camera Title, Date, Time, Alarm/Loss/Motion Message Supports Video Playback Motion Detection Video Loss Detection Specifications: Picture Tube: 21" CRT Resolution: 450 TV Lines - 720 x 480 60Hz System: NTSC/PAL Video Input: 8 x 6 Pin DIN 4-in-1 Ports (Video-in, Audio-in, Audio-out, Camera Power) Video Input: 1 RCA Port Video Output: 1 RCA Port Audio Input: 1 RCA Port Audio Outout: 1 RCA Port Power Source: AC 100V - 240V 50/60Hz Power Consumption: 75 Watts Operating Temperature: 0 C to +40 C Operating Humidity: 10% to 90% (Non-Condensing) Dimensions: 19.3" Wide x 17.6" High x 19.2" Deep (490mm x 448mm x 487mm) Weight: 71 Lbs (32Kg) Package Includes: 21" 2-Page / 8 Channel Color Quad Observation Monitor 8 x 6 Pin DIN Adapter Connectors AC Power Cord Operation Manual