🔹 Key Features

✅ Multi-Playback Modes

• Bluetooth 4.1 (A2DP for music, HFP for calls)

• TF Card (MicroSD) MP3/WAV Playback

• USB Flash Drive Support (U-Disk Mode)

• FM Radio (87.5–108MHz, with auto-scan)

• AUX 3.5mm Input (Wired audio backup)

✅ Built-in Audio Amplifier (3W–5W x 2) – Drives small speakers directly. ✅ Full Decoder Support – Handles MP3, WAV, WMA, FLAC (varies by model). ✅ LCD Display (Optional) – Shows track info, volume, and mode (on supported versions). ✅ IR Remote Control – Adjust volume, skip tracks, switch modes. ✅ 5V–12V DC Power Input – Flexible voltage (USB 5V or 12V adapter).

📌 Applications

🔊 DIY Bluetooth Speakers – Turn passive speakers wireless. 🚗 Car Audio Mods – Replace old cassette/CD players. 📻 Home Stereo Upgrades – Add Bluetooth to vintage systems. 🎤 Karaoke & Portable PA Systems – Small-scale amplification. 🛠️ Embedded Audio Projects – Robotics, interactive displays.

🔧 Technical Specifications

• Bluetooth Version: 4.1 (Class 2, ~10m range)

• Supported Codecs: SBC (A2DP), MP3, WAV, WMA

• Amplifier Output: 3W–5W per channel @ 4Ω (TDA2822M/PAM8403 chip)

• Power Input: DC 5V–12V (USB 5V or 12V adapter)

• Audio Output: Stereo L/R (via screw terminals or 3.5mm jack)

• Frequency Response: 20Hz–20kHz (±3dB)

• Signal-to-Noise Ratio (SNR): ≥75dB

• Dimensions: ~50mm × 50mm (varies by model)

⚙️ How to Use

1. Power Up – Connect 5V–12V DC (e.g., USB power bank or 12V adapter).

2. Select Mode – Press MODE to switch between Bluetooth/TF/USB/FM/AUX.

3. Pair/Play – For Bluetooth, pair with phone (default name: "MP3-DECODER").

4. Connect Speakers – Wire to L+/L-/R+/R- terminals (4Ω–8Ω speakers).

📂 File Playback (TF/USB)

• Supports folder navigation (max 32GB FAT32).

• Files must be named 001.mp3, 002.wav, etc. (auto-sorted).

🚀 Why Choose This Board?

✔ All-in-One Audio Hub – No need for separate amps/decoders. ✔ Plug-and-Play – Works out of the box with minimal wiring. ✔ Budget-Friendly – Cheaper than buying individual components. ✔ DIY-Friendly – Easy to embed in custom enclosures.