product description:
support MP3 format power automatically play play the status of the red LED update.
support U disk (tested over 32G) TF card (tested 16G) playback mode; power default TF card mode if the TF card does not exist automatically jump to U disk mode and both devices are installed you can manually Set the playback mode please refer to the key
operation instructions.
button to adjust the up and down track switch volume + - pause / play mode switch

Note:
long press time about 2S
If you use U disk mode the proposed 5V power supply some U disk does not support 3.7V power supply.
Product specifications
Power supply range: 3.7 ~ 5.5V
Product Size: 45mm * 36mm
Exquisite double board design large area copper stable and reliable.
Anti-static bag refined packaging to avoid damage to the way of delivery static electricity.

Package:
1 x Mp3 lossless decode board

Note:
Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.