For TVs without AV jacks, this RF modulator helps adapt older TVs to VCRs, DVD players, camcorders and more. For TVs without AV jacks, this RF modulator helps adapt older TVs to VCRs, DVD players, camcorders and more. MODEL RF602 RF output channels 3/4CH RF output level 67±3.5dBuV RF output impedance 75ohm Input 3RCA A/V Power Source 95-250V RF-507 AUDIO VIDEO RF MODULATOR