Desk Accessories -SD TF Card Reader Decoding Amplifier Board Module USB MP3 Player Highlights generic brand SD TF Card Reader Decoding Amplifier Board Module USB MP3 Player Description: Superior sound quality . The built-in 2W mono amplifier (5V power up to 3W) is directly connected to the speaker (recommend 4 3W speakers), the gold-plated 3.5mm headphone jack can connect with headphones or external audio. With a micro USB port. Through the mobile phone data line, you can use mobile power or USB cable to charge, you can also use 3.7V lithium battery or USB 5V power supply. Card support TF (mobile phone memory card) and U disk play mode. No soldering with speaker terminals for easy wiring. The module is designed to facilitate modification. specification: Power range: 3.7-5.5V Support MP3 format, auto play. When playing an mp3, the red LED flashes. Support U disk (32G test), TF card read mode (16G test); turn on the default TF card mode, if the TF card does not exist, automatically switch to U disk mode, and the two devices are installed, you can manually set the play mode. Buttons can be adjusted up and down to control songs, volume up and down, pause or play, switch modes. Press menu button to enter single/all songs play mode. The default mode is all songs on power-up. Pressing the Repeat button can override the circulation mode. Key operating instructions: "Prev/V--" button: "Press" to switch previous song, "long press" to volume down. "Next / v++" button: "Press" to change the next song, "long press" to increase the volume. "P/P/Mode" button: "Press" for "Play/Pause" switch, "long press" for U disk, TF card mode. "Repeat" button: "Press" for "single/all song" mode (no long press). Package includes: 1 x MP3 decoding board