4-CH real time receiver Description:>Infra-red LEDs for night-time vision, Effective night ... for outdoor usage,Alloyed shell> 4-channel real-time wireless receiver,Alloyed shell, Antenna can be changed by yourself> Built-in ... blockReceiver:Transmission frequency ISM 2,400 MHz~2,483 MHz 4CH Receiving Sensitivity -85dBm Power Adapter DC 5V/1000mAtransmission distance without ...