100% Brand New Powerful small size wireless transmission up to 100M. 2.4GHz Wireless Transmitter/Receiver System Specifications Transmitter: Transmitting Frequency: 2.411GHz, 2.431GHz, 2.451GHz, 2.471GHz, Number Of Channels: 4 A/V Mod Method: FM RF Power: Model A:20mW; Model B:100mW; Model C: 1W Input: VIDEO OUT+R/L AUDIO IN Power: DC 9V, Model A, B:220mA; Model C: 350mA Operating Tempera Ture: -10C-50C(14F-122F) Receiver: Receiving Frequency: 2.411GHz, 2.431GHz, 2.451GHz, 2.71GHz, Number Of Channels: 4 A/V Mod Method: FM Output: VIDEO OUT+R/L AUDIO IN Power: DC 9V,180mA Operating Tempera Ture: -10C-50C(14F-122F)