Fangrui Product Details Features: The Rf Modulator Is Fit For Your Own Local Catv System. Vhf Working Frequency For Pll Controlled, Hd Input, A/v Output, Rf Output.selectable Output Channels. The Rf Coaxial Converter Supports Ntsc Tv Format Output, No Need To Install Driver Program, Portable, Flexible, Plug And Play. The Vhf Demodulator Converter Has Personalised Design, Exquisite Workmanship, Making You Fondle Admiringly. The Rf Modulator Is Made Of High Quality Plastic Material, Sturdy, Durable And Long Service Life. Professional Manufacturing, Stable Characteristics And High Reliability. Specifications: Model: M61a Standard: Ntsc Frequency Range: Ch3=61.25mhz / Ch4=67.25mhz Output Impedance: 75 Ohm Output Level: 805dbv Sound System: M=4.5mhz Video Input Impedance: 75 Ohms/1k Ohms (switch Able) Audio Input Impedance: 133k Ohms Tv To Ant Insertion Loss 50-860: -62db A/v Connector: Rca Female Rf Input: F Female Rf Output: F Female Power Consumption: Usb 5v Dc Operating Temperature: 0~ +40material: Plastic Colour: