Sennheiser Set 810 S Bedienungsanleitung Seite 33

Using the induction neck loop
Put the EZT 1011 induction neck loop around your neck and insert its
plug into the socket at the top of the receiver. Set your hearing aid to
position "T".
Adjusting the volume
Adjust the receiver's volume with the operating
control. Make sure your hand doesn't cover the
operating control completely. This may prevent
interference-free reception.
If you are not using the receiver, pull the 3.5 mm
stereo jack plug out of the receiver's socket to
avoid discharging the battery. The receiver is
then turned off.
SET 810 S 7