Shure QG-H2-US Q5X MicCommander Controller for Q5X TransmittersShure QG H2 US Q5X MicCommander Controller handheld remote control communicates with Q5X transmitters via a 2. 4 GHz control channel that operates through clothing, walls, and over long distances (up to 40m). Remotely turn transmitters on and off, place transmitters in storage mode, change frequencies, RF power levels. Features of the Shure QG H2 US Q5X MicCommander Controller for Q5X Transmitters: Required for operation of Q5X transmitters (up to 32