Wolfwhoop WR832 5.8GHz 40CH Wireless FPV Receiver for Racing Drone and Multicopter Long range more than 2km range in the open area - Plug and play Power off memory: Replay the very last frequency band and channel Two switching buttons: easy to change frequency channels and bands 40 channels: 5 bands and all frequencies compatible, Cover A, b, E, F, r bands Universal video transmitter and receiver for all, compatible with various kinds of remote control toys (RC helicopter, quadcopter, airplane and boat etc.)