Product introductionParameter /ModelWS-8173WS-8175WS-8176Image sensor1/4 SHARP CCD1/4 SONY HAD CCD1/3SONY Super HAD CCDHorizontal Resolution420TVL420TVL420TVLEffective pixelPAL: 512(H) * 582(V)NTSC: 512(H) * 492(V)PAL: 512(H) * 582(V)NTSC: 512(H) * 4