Beurer PC 100 Posture Control Mode D'emploi page 44

5. Switch on the posture control. The LED starts to light up green. If the
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posture control cannot be switched on, the battery in it is flat and the
LED flashes red. Recharge the battery as described in the "Charging
the battery" section.
6. Attach the posture control to the back of the neck area of your top
as shown (e.g. shirt collar, blouse, T-shirt). Ensure that the long side
is facing the inside, and the short side with the clip is on the outside.
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