The RF modulator is fit for your own local CATV system. VHF working frequency for PLL controlled, HD input, A/V output, RF output. 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 ABS material, sturdy and long service life. Professional manufacturing, stable characteristics and high reliability. Standard: NTSC Frequency Range: CH3=61.25 Output Impedance: 75Ω Output Level: 80±5dBμV Sound System: M=4.5MHz Video Input Impedance: 75Ω Audio Input Impedance: 13±3kΩ TV to ANT Insertion Loss 50-860: -6±2dB A/V Connector: female RF Input: TV Female RF Output: TV Male plug Power Consumption: USB 5V DC Operating Temperature: 0℃-+40℃ Colour:Black Material:plastic Package Contents: 1 x AV TO RF Modulator(Due to different product batches, the appearance , which does not affect the use) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.