... iris lens, synchronization, automatic white balance 20M Waterproof Camera 1. Features:SG- 213 :1/4" Sharp CCD, 400TVL, 6mm lens, 24pcs φ5 ... , 24pcs φ5 IR, view distance 20M, with sun shield SG-143:1/3" Sony CCD, 540TVL, 6mm lens, 24pcs φ5 IR, view ... ) x 492(V)Signal SystemPAL/NTSCLens6mmWhite BalanceAutoElectronic Shutter1/50(1/60)~1/100,000 secSync SystemInternalS/N Ratio>48dBOperation Temperature-20°C ...