Item Type: Bluetooth MP3 Decoder Board Material: ABS Panel Size: Length: Approx. 8.5cm/3.3in Height: Approx. 2.4cm/0.9in Depth: Approx. 2.4cm/0.9in Working Voltage: 5V Working Current: 1.5A-2A Power: 4 Ohms 3W+3W Sound Output: 3P OUT Sound Output (When the External Power Amplifier Is Used, The Module Must Be Powered by a Separate Independent Power Supply) Screw Mounting Hole Spacing: Approx. 7.5cm/3.0in Bluetooth: Bluetooth 5.3 Package List 1 x Bluetooth MP3 Decoder Board 1 x Power Cord 1 x Horn Cable Manual measurement please allow some error. 1Easy 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. 2USB and Memory Card: Bluetooth MP3 decoder board supports USB and memory card switching, previous, next, volume adjustment, playback or pause. 3Bluetooth Function: Bluetooth 5.3 sound decoder module supports Bluetooth previous, next, volume adjustment, play or pause, mute. 4Power 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. 5Serial Communication Control: MP3 decoder board supports serial communication control, mode, volume, song selection, stop or play, loop selection.