Model FW-831CL FW-841CL FW-641CL Image Sensor 1/3"SONY CCD 1/4"SONY CCD 1/4"SHARP CCD Pixels PAL:512(H)x582(V) NTSC:512(H)x492(V) Signal System PAL/NTSC(Optional) Horizontal Resolution 420TVL Min Illumination 0Lux/F1.2,48LED Lens 6mm BLC Auto AGC Auto Electronic Shutter 1/50(1/60)~1/100,000 Second White Balance Auto S/N Ratio >48dB