Feature: 1. Superior Sound Quality: Enjoy high-quality audio with the MP3 Lossless Decoding Board equipped with a built-in 2W mono amplifier (up to 3W with 5V power supply). Connect directly to speakers (recommended with 4Ω 3W speakers) or use the 3.5mm gold-plated headphone jack for headphones or external speakers. 2. Versatile Power Options: The board features a MicroUSB power interface, allowing you to power it with a mobile power bank, USB charger, or a 3.7V lithium battery. USB 5V power is also supported. 3. TF Card and USB Playback: Easily play music from TF cards (phone memory cards) or USB drives. Enjoy convenient access to your favorite songs without the need for a separate media player. 4. Hassle-Free Speaker Connection: With built-in speaker wire terminals, there's no need for soldering, making it easy to connect your speakers quickly and securely. 5. Modular Design for Easy Customization: The module's design allows for convenient modifications and customization, making it suitable for DIY projects and various applications. Specification: Power supply range: 3.7-5.5V Product size: 45mm * 36mm/1.77 * 1.42in Net weight: 18g Product Overview: 1) Supports MP3 format, automatically plays when powered on, and updates the red LED indicator when playing. 2) Supports USB flash drive (tested 32G) and TF card (tested 16G) playback modes; The default TF card mode is when powered on. If the TF card does not automatically jump to USB flash drive mode and both devices are installed, the playback mode can be manually set. Please refer to the button operation instructions for details. 3) Press the button to adjust the up and down track switching, volume+-, pause/play, and mode switching. Please refer to the button operation instructions for details. 4) You can set the "single/full track" cycle with the button, and the default full track cycle is when powered on. Press the "Repeat" button to change the cycle mode Key operation instructions Pre/V - "key:" Short press "to switch to" Previous "song," Long press "to" Volume decrease " Next/v++key: "Short press" to switch to "Next" song, "Long press" to "Volume up" P/P/Mode "key:" Short press "for" play/pause "switching," Long press "for USB flash drive, TF card" mode "selection Repeat key: "Short press" to cycle between "single track/full track" (without long press function) Attention: 1. Press and hold for approximately 2 seconds 2. If using USB flash drive mode, it is recommended to supply 5V power. Some USB flash drives do not support 3.7V power supply