Galaxy Audio VHF - Manual (Page 7)

Functions of the HH18 Hand Held Transmitter Functions of the HH18 Hand Held Transmitter
Changing Batteries:
Expected life for two 1.5V AA alkaline batteries is about 8 hours.
When the battery indicator lights the batteries should
be changed immediately (as shown below).
Microphone Grille
Low Battery Indicator
Lights when the battery is low
Power Switch
Battery Door
4