Model SG-680 SG-680S SG-681 BS-681S Pickup device 1/3-inch super HAD Sony 1/3-inch Sony CCD 1/4-inch Sony CCD 1/4-inch Sharp CCD Number of pixels PAL:512(H) X 582(V) NTSC:512(H) X 492(V) System of signal PAL/NTSC Horizontal resolution 420TV Line Minimum illumination 0.8Lux/F1.2 Lens mount C/CS Backlight compensation ON/OFF(Optional) Electronic shutter 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 -20~50(Centigrade) Sync system Internal Video output 1.0v p-p /75 Power consumption DC12V,150mA/AC24,120mA/AC220,10mA Dimension(mm) 90(L) ?8(W) ?1(H) Weight(g) 340G