4 Camera Color Multiplexers 
QC43E Dual Quad QC43-E

Dual-Page function; High Resolution 720x576(PAL) 720x480(NTSC); 4 channels real-time display; Auto gain control and synchronization Time, date and camera titles display; Freeze individual quadrant function 8 alarm input, 1 alarm output On screen individual brightness, contrasts and color adjustment; VCR Playback, many PIP modes, 2x2, picture zoom in; S-Video output RS-232 remote control; Two Monitor outputs: Quad and Full Screen/ Sequence. price does not include power adaptor, neither alarm line