Beyerdynamic S 900 Notice D'utilisation page 38

2.2 How to insert the batteries / rechargeable
battery pack
1. Push down the two snap locks on the right and left of the battery
compartment and open it. Remove the batteries. Refer to Fig. 1.
2. Insert two 1.5 V batteries into the battery compartment observing polarity
markings. Refer to Fig. 2. The battery pack is secured mechanically against
confusing the poles. Then close the battery compartment again.
TS 900 M: Insert batteries
Fig. 1
TS 900 C: Insert rechargeable battery pack
Fig. 1
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Fig. 2
Fig. 2