Sangean WR-22 (V1) - Manual (Page 25)

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Playback MP3 or WMA Files from USB
This section describes how to use your radio to access and
playback your audio files via USB memory devices. USB slots are
located on the front panel of the unit. Important: Your radio is only
designed to work with USB memory flash memory devices. It is not
intended to be connected to hard disk drives or any other type of
USB device.
It is possible to use SD or SDHC cards for media playback when
held in a suitable USB adaptor. However, due to the wide variation
of such adaptors, it is not possible to guarantee that all adaptor /
card combinations will work with the radio.
The unit has been tested with a range of USB memory devices
of up to 32GB capacity. It supports USB 2.0 full-speed and USB
3.0. (Note: when using USB 3.0, at the beginning it will show ‘No
device’ on the display, please allow the unit to detect the device for
a longer period of time.) USB memory must use the FAT or FAT 32
filing system in order to operate with the sound system, it does not
support NTFS.
Audio formats supported for playback are MP3 and WMA. Playback
does not support files encoded using WMA lossless, WMA Voice,
WMA 0 professional, nor files of any format which have DRM
protection.