The Foxeer ClearTx is an adjustable power video transmitter that has been designed for FPV use and includes a pit mode and a gradual power up sequence that prevents interference with other pilots. This VTX has brilliant video filtering and can support up to 8 pilots on the same band at the same time (as long as they are all using this Foxeer ClearTx). This unit is perfect for racing quads as it is very compact and lightweight, only 6.8g. It is not supplied with an antenna, which means you can use an antenna of your choice (MMCX connector). This version is adjustable and has 4 power output options, 25, 200, 600mW and pit mode. Power Output 25mW: This setting is legal in Europe and the UK, it’s 25mW power output and 27 channels are free to use in these areas without a license. Even at this low power with a standard antenna you can achieve a range of approximately 200 metres. However, if you use good quality antennas you should be able to achieve in excess of 300 metres. Low power settings are perfect for indoor environments; high-powered transmitters often cause multipathing (poor signal quality caused by the signal being reflected by obstacles). Power Output 200mW: 200mW is a power output used by a lot of FPV mini quad racers. It's enough to provide a decent range and reception and equally will not cause massive interference which spoils everyone else’s fun or cause excessive drain on your battery. Power Output 600mW: On this setting the transmitter certainly packs a punch, 600mW is enough for 1km plus line of sight long-range flights. Features: Adjustable power output 25/200/600mW Can support upto 8 pilots on same band Pit mode Compact (22.5 x 31.5 x 6.6mm) Lightweight (6.8g) If you use SMA antennas, we sell a MMCX to SMA Converter. Note: Please check with your local authorities regarding the operation of this equipment before you purchase. Regulations on power output, usable frequencies and licenses’ to operate vary from region to region.