Micro SD Card & USB MP3 Decoder Board with Amplifier Product Overview This Micro SD Card & USB MP3 Format Decoder Board is a compact PCB amplifier player designed for easy integration and modification. It delivers superior sound quality with an onboard mono amplifier and supports multiple playback sources, making it suitable for a wide range of audio projects. Key Features Superior sound quality output Built-in 2W mono amplifier (up to 3W with 5V power) Direct speaker connection via terminal (recommended 8–16Ω, 3W speaker) 3.5mm gold-plated headphone jack for headphones or external stereo audio output Micro-USB power input port Powered by USB 5V supply or 3.7V lithium battery Supports Micro SD / microSD cards and USB disk playback No soldering required for speaker terminals, enabling easy wiring Designed to facilitate modification Playback & Functionality Supports MP3 format with automatic playback on power-up Red LED flashes during MP3 playback Default playback mode is SD/microSD card Automatically switches to USB disk mode if no SD/microSD card is detected Manual mode switching available when both storage devices are installed Button controls support song selection, volume adjustment, play/pause, and mode switching Menu button allows selection between single-song and all-song play modes Default play mode on power-up is all-song mode Repeat button adjusts circulating playback mode Key Operating Instructions Prev / V-- Button Press: Previous track Long press (~2 seconds): Volume down Next / V++ Button Press: Next track Long press (~2 seconds): Volume up P / P / Mode Button Press: Play / Pause Long press: Switch between USB disk and SD/TF card mode Repeat Button Press: Toggle single-song / all-song mode Product Specifications Specification Details Supported Formats MP3 Power Range 3.7V – 5.5V Supported Storage USB disk (tested 32GB), SD/microSD card (tested 16GB) Product Size 45mm × 36mm Design & Build Exquisite double-board design Large copper area for improved stability and reliability Supplied in an anti-static bag to prevent electrostatic damage during transit Important Notes A 5V power supply is recommended when using USB disk mode, as some USB drives do not support 3.7V power Overvoltage on the battery input connections will damage the board and is not covered by warranty Package Contents 1 × MP3 Player Board
