PERFECTPRO USB BOX Mode D'emploi page 21

(5) Using the USB power to charge external device
Using AC power as power source,
5-1 Press and release SOURCE button to select AUX-IN.
5-2 The USB power LED shows green.
5-3 Connect USB cable (not supplied ) between USB slot of
USBBOX and I/O port of MP3 media player or mobile phone.
5-4 USB can offer 5V 0.5A power to charge external device by
AC power source and only offer 5V 0.25A by battery power.
5-5 The charging current limit is 5V 0.5A, if the loading is over
the limit, the USB LED will light RED and LCD display shows
Over Load and check the device. Within a few seconds,
the radio will switch off.
Note:
1. It is recommended to use AC power to power the radio while charging
MP3 media device or mobile phone via USB slot though the battery
is also able to charge the device, however using the battery to charge
the device will consume much energy and drain the battery easily.
2. The USB charging may not support the entire iPod and iPhone range.
3. Once the USB power indicator turns to RED indicating it's over
powered and won't supply USB power until removing the external
device and restarting the radio power until USB power indicator turns
to green.
4. It's recommended not to use a portable hard disc as external device.
It may easily over load the radio.
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