CMOS/CCD image sensor: Sony/Sharp/Samsung (optional)Horizontal resolution: 420TVL (Sharp/Samsung); 480~570TVL (Sony) (optional)PAL (H x V): 500 x 582 (420TVL); 752 x 582 (480TVL)NTSC (H x V): 512 x 49

21" pure flat CRT1CH video and audio signal inputOSD menuSystem: PAL/NTSCVideo input: 4 channels (DIN)Video output: 1 channel (BNC)Audio input: 4 channels (DIN)Audio output power: >0.5WResolution

Ringing bell chime when guests visitVideo talking with visitors image displayed on screenMultilateral intercom call by pressing "CALL" buttonMultilateral intercom talking while with no audio

Ringing bell chime when guests visitVideo talking with visitors image displayed on screenMultilateral intercom call by pressing "CALL" buttonMultilateral intercom talking while with no audio

CMOS image sensor (color or B/W optional)4" display panel (TFT LCD or B/W flat tube CRT optional)Vivid picture and clear sound"Ding-Dong" chime when guests visit30 seconds auto power-of

CMOS image sensor (color or B/W optional)4" display panel (TFT LCD or B/W flat tube CRT optional)Vivid picture and clear sound"Ding-Dong" chime when guests visit30 seconds auto power-of

Product Name: 15" LCD MonitorModel Number: JIT-M150CD4Place of Origin: ChinaVideo input: 4 channels independent input 1.0Vp-p, 75Ω BNCVideo display: several display modes, such as single-men

Video input: 4 channels independent input 1.0 Vp-p, 75Ω BNCVideo display: several display modes, such as single-menu, dual-menu and quad-menuVideo standard:PAL: 25fps; CCIR: 625 line; 50 fieldNTS

Video input: 4 channels independent input 1.0 Vp-p, 75Ω BNCVideo display: several display modes, such as single-menu, dual-menu and quad-menuVideo standard:PAL: 25fps; CCIR: 625 line; 50 fieldNTS