MODEL CHK -666 CHK -666B Day&night CHK -66610R Day&night,IR CHK -665 CHK -665B Day&night CHK -665R Day&night,IR CHK -688 Day&night Pick-up device 1/3 Sony Number of pixels PAL:512(H) 582(V) NTSC:512(H) 492(V) System signal NTSC/PAL Horizontal resoltion 480TV Line 540TV Line 480TV Line Minimum illumination 0.8Lux/F1.2 0.5Lux/F1.2 0.8Lux/F1.2 0.5Lux/F1.2 0.01Lux/F1.2 Lens mount C/CS Backlight compensation on/off(optional) Electronic shutter Auto 1/50(1/60)~1/100,000sec AGC on/off(optional) White balance on/off(optional) S/N ratio >48dB Gamma correction >0.45 Operation temperature -20degree~50degree Sync system Internal Video output 1.0v p-p /75ohm Power consumption DC12V,<500mA weight(g) 239(g)