When the transmission distance is over 100 meters, choosing GP antenna has better effect. Using GP antenna for transmission can choose 24V power supply. The transmission channel can be set through buttons:VHF/5 - 12 channels,UHF/13 - 36 channels Choose a hardware transmitting antenna, minimize the power, and use 12V power supply. Functions: 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 TVs, 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 Colour:silver Material:Metal Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. voltage: AC100-240V Package Contents: 1 * Analog TV Transmitter 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.