RCA RT1971-AC Mode D'emploi page 12

as follows:
Recharge it
Charging by supplied AC/DC Adaptor: Charging by supplied AC/DC Adaptor:
1. Connect the small plug from the supplied AC/DC Adaptor to the DC IN Jack on the right of unit.
2. Connect the AC/DC Adaptor to the wall outlet having
Recharge and store the device within the temperature range of 5°C~35°C (40°F~95°F).
Charging by the supplied Car Adaptor: Charging by the supplied Car Adaptor:
1. Connect to the cigarette lighter socket of a vehicle with a 12V battery as the figure below.
It is NOT compatible with It is NOT compatible with
2. This is a special negative grounded
Car Adapter. Using this Car Adapter
with a plus grounded car can cause
malfunction.
3. Do NOT plug in the Car Adapter until
the car ignition is turned on.
4. Disconnect the Car Adapter from the
cigarette lighter and the unit after use.
a vehicle that has a 24V battery. a vehicle that has a 24V battery.
To DC IN Jack on the unit
AC 100-240V~; 50/60Hz.
To the cigarette
lighter socket