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 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. Colour: blue Material: plastic+metal Size: 45 x 36mm Package Contents: 2 x MP3 Decoder Module Only the above package content, other products are not included. Note: Light 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. 2 pcs Mp3 Lossless Decoder Board Mp3 lossless decoders power amplifier Mp3 player module Mp3 decoder board support TF card and USB.Support MP3 format, playing power on automatically, playing state red LED indicator update.Super quality, onboard 2W single channel power amplifier. Support TF Card (mobile phone memory card), U disk playback mode With the speaker terminals without welding, convenient wiring Module design and convenient refit.Can be set button.