Sennheiser DECT Comfort call User Manual page 31

Charging the headset and storing the headset system
30 | DW Series - User Guide
If the headset is outside the range of the base station, it will switch
off after 30 minutes in order to conserve battery power.
Charging the headset using the optional CH 10 headset charger
The CH 10 headset charger is an optional accessory available from your
Sennheiser partner. The CH 10 allows you to charge additional DW series
headsets, e.g. for sharing the same base station when working shifts.
Refer to the instruction manual of the CH 10 for more information.
DW Office – HS
DW Pro1 – HS
DW Pro2 – HS