Feature: Supports MP3, WMA, WAV, FLAC, and APE audio formats Supports playback via MP3, USB flash drive, TF card, LINE IN, FM radio, and Bluetooth Power Supply: 5V or 12V Three-button control: PREV, PLAY, NEXT Built-in FM radio functionality 1. PREV button: Short press skips to previous track (MP3 mode); long press decreases volume 2. PLAY button: Short press toggles play/pause (MP3 mode); long press cycles through input sources (USB / TF / AUX / Bluetooth) 3. NEXT button: Short press skips to next track (MP3 mode); long press increases volume Auto-source detection: Default mode is Bluetooth when no media device is connected; automatically switches to connected device (USB/TF/FM/AUX/Bluetooth) TF card support: Up to 32GB USB support: Up to 32GB LED indicator PREV / VOL-: Short press selects previous track; long press decreases volume PLAY / PAUSE: Short press toggles play/pause; long press cycles input sources. In FM mode, short press initiates auto-scan. NEXT / VOL+: Short press selects next track; long press increases volume Material: Plastic and metal Color: Silver Package Includes: 1 x DIY Decoder Board Note: Color may vary slightly due to lighting and screen settings. Measurement tolerance: ±1–3 cm.