Feature: Support MP3/WMA/WAV/FLAC / APE Support: MP3 / USB (U disk) / TF / LINE IN / FM / BLUETOOTH Power Supply: 5V 12V Three buttons: PREV/ PLAY / NEXT; With FM: Support FM Radio function 1. PREV button (previous song/volume reduction): In the MP3 state, the PREV short press is the previous song, and the long press is the volume reduction; 2. PLAY button (play / pause): PLAY short press for play / pause in MP3 state; long press is USB / TF card / AUX / Bluetooth mode test tone switch. 3. NEXT button (next song / volume increase): NEXT short press for song in MP3 state, long press for the volume to increase; 4. This model has the function of automatic conversion device. When there is no device, the default is in the Bluetooth state. If there is a device, the device is interpreted first. ① TF: Connect TF memory card (up to 32GB) ② USB: Connect USB flash drive (up to 32GB) ③ LED indicator ④ PREV/VOL-: Short press is to select the previous song; long press is to decrease the volume ⑤ PLAY/PAUSE: Short press is the switch between pause and play; Long press is the switch of USB / TF / FM / AUX / BLUETOOTH sound, in the radio FM state, the short pause play button is automatically searched; ⑥ NEXT/VOL+: Short press is to select song; long press is to increase the volume; Material: plastic+metal colour: Silver Package Contents: 1 x DIY Decoder Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.