Ericsson GH337 User Manual page 52

Portable handsfree
If a portable handsfree set is fitted to the phone, the vehicle
charger (the travel charger) can be used to power the
phone from a cigarette lighter outlet (from a mains socket).
To cigarette
lighter outlet
Portable Handsfree:
Powering the phone from a
cigarette lighter outlet
To mains
socket
Portable Handsfree:
Powering the phone from the
mains