Function Identification: Transmitter
1.
Charging Cradle
2.
LED Indicator of Tone Clarity
3.
Tone Clarity Button
4.
LED Indicator of Power/Signal
5.
LED Charging Indicator for Main Battery (attached to Headset Receiver)
6.
LED Charging Indicator for Spare Battery
7.
Spare Charging Slot
8.
DC In
9.
Mono/Stereo Select
10.
Optical input
11.
3.5mm Audio In