Sangean U4 DBT (V1) - Manual (Page 47)

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Charging with USB socket
You can use the USB jack charging function by following the procedure
below.
. Press the Power button to switch on your radio.
. Press and release the Menu button until the Advanced menu of
the current mode shows on the display.
3. Rotate the Tuning control until 'System ' appears on the display.
Press and release the Tuning control.
4. Rotate the Tuning control until 'USB Charge' appears on the display.
Press and release the Tuning control.
5. Rotate the Tuning control to select the desired setting. The options
are On or Off.. the default is Off.
Note:
1) The USB jack can only provide power for the USB memory stick
only with A 5V maximum and most of iPhone models. However,
it does not support external Hard disk drive, all types of mobile
phones and electronic device.
2) The maximum volume of the output power speaker will decrease
when your USB is charging.
Important:
1) Do not connect this USB socket with your PC USB port, as it
highly possible may cause breakdown of the unit.
2) Never use the USB socket in rainy or moist conditions to prevent
moist from entering the radio. Always keep the rubber cover on
the back well closed under these conditions.