Features 1.Easy to Switch, Multiple Formats Supported: Bluetooth MP3 decoder board supports USB, memory card, Bluetooth, FM switching between switching. Support MP3 WMA WAV FLAC APE format music. 2.USB and Memory Card: Bluetooth MP3 decoder board supports USB and memory card switching, previous, next, volume adjustment, playback or pause. 3.Bluetooth Function: Bluetooth 5.3 sound decoder module supports Bluetooth previous, next, volume adjustment, play or pause, mute. 4.Power Off Memory: MP3 decoder board supports power off memory function, which can remember the songs and volume played before the power off to the current point. 5.Serial Communication Control: MP3 decoder board supports serial communication control, mode, volume, song selection, stop or play, loop selection. specificationItem Type: Bluetooth MP3 Decoder Board_x000D_ Material: ABS_x000D_ Panel Size:_x000D_ Length: Approx. 8.5cm/3.3in_x000D_ Height: Approx. 2.4cm/0.9in_x000D_ Depth: Approx. 2.4cm/0.9in_x000D_ Working Voltage: 5V_x000D_ Working Current: 1.5A-2A_x000D_ Power: 4 Ohms 3W+3W_x000D_ Sound Output: 3P OUT Sound Output (When the External Power Amplifier Is Used, The Module Must Be Powered by a Separate Independent Power Supply)_x000D_ Screw Mounting Hole Spacing: Approx. 7.5cm/3.0in_x000D_ Bluetooth: Bluetooth 5.3 PackageList 1 xBluetoothMP3DecoderBoard 1 x Power Cord 1 x Horn Cable NoteManual measurement please allow some error.