Features: It is analog TV signal transmitters and a wireless RF signal converters. It supports imported N-system TVs, with accompanying sound 4.5-6.5 conversion, and supports Video output and simultaneous transmission. The transmitting frequency is adjustable. It supports FM radio to receive TV accompanying sound. When you input high-clear signal, the high-clear of your set-top box is occupied by the transmitters, and the previous LCD TV cannot be used. At this time, the LCD TV can be connecting to the video terminals of the transmitters, which can realize the simultaneous work of LCD TV and transmitters. Press and hold the menu button to enter the setting: UHF/VHF, transmitting frequency setting and accompanying sound frequency setting. Transmission distance: Even if the transmitters is used within 20m/65.60ft between two wall, you can still watch old color TV and black and white TVs in a clear way. DC9V power supply: There is a phenomenon of heating, but this is a normal phenomenon. To do it without heating, you can use 5V power supply, but many 5V USB power supplies, will cause imaging interferences. Specifications: Component:Aluminum Plate Size:Approx.10x10x6cm/3.94x3.94x2.36inch It supports multiple devices to receive, meeting your different needs. Universal type for color TVs and black and white televisions Multiple input method: Supports set-top box, networking set-top box, computers and mobile phones With OLEDs screen and HDTV interfaces Supports 9V power supplies Powerful performances with low energy consumption 360-degree coverage without dead ends The transmission distance: 10-20m/32.8-65.60ft Package Includes: 1pc Transmitting Board 1pc Transmitting Antennas 1pc USB power cable (5V input ) note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.