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Sennheiser RS 175 Owner's Manual

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Product overview
RS 175 
| 9
LED indicators on the transmitter
After taking the headphones from the holder of the transmitter, the
charge status LED indicates the approximate operating time of the
headphones:
SURR
     
LO
HI
BASS
1
4
2
3
1
Charge status LED
Meaning
The transmitter is not charging.
The rechargeable batteries are being 
charged.
The rechargeable batteries are fully charged.
A charging/battery fault has been detected.
Charge status LED
Operating time
Battery capacity 
up to 4 hours
0 to 25%
approx. 4 to 9 hours
25 to 50%
approx. 9 to 14 hours 50 to 75%
approx. 14 to 18 hours 75 to 100%
2
Surround sound LED
Meaning
The surround sound is deactivated.
LO
: Low surround sound mode is active.
HI
: High surround sound mode is active.