Production characteristic:   Alarm Design Camera SONY CCD 420/480/540TVL 3.7mm Pinhole Lens Audio is optional Suitable for Hidden Assembled   Technical Parameter:   Model S3M S4M H3M H4M Image Sensor 1/3"SONY CCD 1/4"SONY CCD 1/3"SHARP CCD 1/4"SHARP CCD Signal System  PAL/NTSC Horizontal System 420TVL Effective Pixels  （H ×V） PAL:500×582；NTSC:510×492 Shuttle Speed PAL=1/50 ~1/100,000 sec；NTSC=1/60 ~1/100,000 sec Mini Illumination 0 Lux S/N Ratio > 48dB（Auto Gain Off） Gamma 0.45 Lens 3.7mm Blacklight Compensation Auto Video Output 1.0VP-P,75Ω White Blance Auto Power  DC12V Current 100mA Operating Temperature  -10 ~ 50℃（relative humidity:the most 95%）