Features: The modulator is fit for your own local CATV system. VHF working frequency for PLL controlled, HD input, A/V output, output.Selectable output channels. The 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 modulator is made of high quality plastic material, sturdy, 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: 80±5dBμV Sound System: M=4.5MHz Video Input Impedance: 75 Ohms/1k Ohms (Switch ) Audio Input Impedance: 13±3k Ohms TV to ANT Insertion Loss 50-860: -6±2dB A/V Connector: female Input: F female Output: F female Power Consumption: USB 5V DC Operating Temperature: 0℃ ~ +40℃ Material: plastic colour: Black Package Contents: 1 x Modulator 1 x USB Cable 1 x English instructions 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.