1.When the transmission distance is over 100 meters, choosing GP antenna has better effect. Using GP antenna for transmission can choose 24V power supply. 2.The transmission channel can be set through buttons:VHF/5 - 12 channels UHF/13 - 36 channels 3.Choose a hardware transmitting antenna, minimize the power, and use 12V power supply. Support high-definition input, high-definition input can be converted to N format and P format. Supports AV input, but cannot convert to N format. Supports converting high-definition input into AV signal output for other displays with AV, such as LCD , and can also transmit signals. Support accompanying sound settings of 4.5MHz-6.5MHz FM Transmission: Simple FM signal transmission, with good transmission effect. The method is as follows: Set the frequency to 85.25 in the VHF band and change the accompanying sound frequency. Adding 85.25MHz to the accompanying sound frequency equals the receiving frequency of the radio. 85.25MHz + 6.5MHz = 91.75MHz 85.25MHz + 6.0MHz = 91.25MHz 85.25MHz + 5.5MHz = 90.75MHz 85.25MHz + 4.5MHz = 89.75MHz The product appearance and printed words from batch to batch, but not affect the use Color: As Shown Material: Aluminum Alloy Package Contents: 1 x Analog TV Transmitter 1 x GP Antenna 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.