Sennheiser SpeechLine Digital Wireless Series System Documentation page 163

Charging the accupack in the CHG 4N charger
To charge an accupack in the CHG 4N charger:
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Insert the transmitter with installed accupack into one of the charger's
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four charging slots. Make sure the charging contacts face downward.
Make sure to insert the transmitter the correct way round. The trans-
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mitter fits into the charger in only one direction.
The CHG 4N charger
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