Night depending on waterproof camera + 4 road wireless voice receiver transmission frequency ISM 2,400 MHz~2,483 MHz 4CH modulation way FM USB 2.0 work temperature 0 ℃ ~ + 50 ℃/+32 ℉ ~ +122 ℉ storage temperature-20 ℃ ~ + 60 ℃/-4 ℉ ~ +140 ℉ work humidity 85%RH camera signal standard PAL NTSC effective pixel 628 (h) x 582 (v) 510 (h) x 492 (v) imaging devices 1/3 " Perspective/lens OmnVision CMOS horizontal definition 380TV Line 45 ° (f=6mm) minimum illumination 0 Lux scanning frequency (horizontal) 15.625KHz 15.734KHz scanning frequency (vertical) sensitivity -85dB 50Hz 60Hz DC12V/500mA receivers suitable distribution sources 75 ω video output audio output 10K ω/500mVp-p/1Vp-p input AC adapter power supply: frequency: 50 60Hz voltage: DC 100~240V output: 5V/1.5A product dimensions 205 x 120 x 43mm receiving frequency channel 1: 2414MHz; 2 channels: 2432MHz, channel 3: 2450MHz; 4 channels: 2468MHz power consumption <8W efficient receiver distance open distance of 150 meters (transmitter power 300mW)