Holux Portable Automobile Navigation System - Manual (Page 18)

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Connecting to AC Adapter and Charging
Before first use, we strongly suggest beginning use with a fully charged
battery.
1. Insert the USB connector into the adapter.
2. Insert the other end into the power port under the unit.
3. Plug the adapter into a power outlet.
4. When charging starts, the charging indicator light will be red,
please wait for the charging to complete (this might take several
hours). After charging is completed the indicator light will be green.
This device uses a Lithium battery, please note the following:
Please do not charge in a hot environment, such as on a balcony or
expose to sunlight.