Features:

• Superior sound quality. Onboard 2W mono amplifier (5V power of up to 3W) is directly connected to the speaker (recommendation 4 Ω 3W speakers), 3.5mm gold plated headphone jack can connect with headphones or external audio.
• Power up the board with a Micro USB port. Use a power cable that you use to charge your mobile phone. Connect to your computer or a USB power adapter to power the module.
• You can also use a 3.7V lithium battery or USB 5V power supply
• Support TF Card (mobile phone memory card) and U disk play mode.
• No soldering with speaker terminals for easy connection. 
• Power range: 3.7~5.5V
• Product size: 47mm x 34mm/18.50 x 13.38′

• Supports MP3 format, starts playing as soon as the power is applied. When mp3 is played the red LED flashes.
• Support U disk (tested 32G), TF Card (tested 16G) play mode; power on default TF card mode.
• Buttons can be used to control songs, volume up and down, pause or play, mode switching, etc. 
• Press menu button enter the single/all song play mode.The default mode is the all song mode when powered up. Pressing the Repeat button can replace the circulating mode.

• ‘Prev / V–‘ button: ‘Press’ for switching previous song, ‘long press’ for volume down
• ‘Next/v++’ button: ‘Press’ for switching next song, ‘long press’ for volume up
• ‘P / P / Mode’ button: ‘Press’ for the ‘Play/Pause’ Switch, ‘long press’ for U disk, TF card mode
• ‘Repeat’ button: ‘Press’ for “single/all song’ mode (no long press)

• ‘Long press’ means approximately press for 2 Seconds
• If you use the module in U disk mode, it is recommended to use 5V power supply, some U disk does not support 3.7V power supply