Readytosky 48CH 5.8Ghz VTX 25mW/200mW/600mW Switchable FPV Transmitter for FPV Racing Drone Adjustable power-25mW/200mW/600mW switchable fpv transmitter. Micro size and light weight,long transmission distance and stable performace. 48CH cover A,B,E,F,R,H bands are compatible with more FPV equipment. Filtered power ensure super clean video, born for racing. Please use the flight control firmware version between 3.17 and 3.2.4,or you will have bugs and cannot reserve the settings of transmitter.