Sennheiser TR 175 Instruction Manual page 12

Product overview
10 | RS 175
3 BASS LED
4
TR status LED
1 s
1.5 s 1.5 s
Meaning
The dynamic bass boost is deactivated.
The dynamic bass boost is activated.
Meaning
The transmitter is connected to the AC wall
outlet.
The transmitter is in standby mode.
The transmitter and headphones are
connected.
The transmitter detects an incompatible
digital audio streaming input.