The USB to micro USB cable is for charging GT10 Transmitter, R10 Receiver, and R20 receivers, as well as MT10 Microphone Transmitters. (The HSL100's BT10 Body Pack transmitter takes 1 x AA Battery and therefore has no charging port.)
Use a micro USB cable to connect to a USB charging port or a qualified power adapter. While charging, please make sure that the device is shut down to avoid the loss of electricity during charging. This can lead to longer charging time and shorter battery life.
While charging GT10 Transmitter, R10 Receiver, or R20 Reciever, the battery LED will light up green to indicate the unit is charging. Once the battery is full, the LED will turn off.
Product: GMU-M100, GMU-M200, GMU-HSL100, GMU-G100