Features: The RF modulator is fit for your own local CATV system. VHF working frequency for PLL controlled, HD input, AV 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 Material: ABS Frequency Range: CH3=61.25MHz CH4=67.25MHz Output Impedance: 75 OHm Output Level: 80+-5dBMicrovolt Sound System: M=4.5MHz Video Input Impedance: 75 Ohms1k Ohms (Switch able) o Input Impedance: 13+-3k Ohms TV to ANT Insertion Loss 50-860: -6+-2dB AV Connector: RCA female  RF Input: F female RF Output: F female Power Consumption: USB 5V DC Operating Temperature: 0 celsius ~ +40 celsius Item Size: 62 * 63 * 25mm 2.44 * 2.48 * 0.98in Item Weight: 52g 1.83oz Package Weight: 107g 3.77oz Package Size: 13 * 10 * 3cm 5.12 * 3.94 * 1.18in Package List: 1 * RF Modulator 1 * USB Cable 1 * User Manual (English)