Sennheiser Set 860 Instruction Manual page 16

Putting the Set 860 into operation
16 | Set 860
Always store the stethoset receiver in the transmitter's
charging compartment to ensure that it is fully charged
when needed. The intelligent battery charging technol-
ogy prevents overcharging.
The display during charging can be set so that it automat-
ically switches off after 30 seconds (see page 36).