Experience high fidelitymusic with the -301B BT5.3 Amplifier Board, for audiophiles seeking powerful and clear sound. This amplifier board features exceptionalperformance, delivering distortion freeaudio output Supporting the operation of function, it requires purchasing two sets of power amplifier boards to form a box This product is quite suitable for DIY simple mono amplifiers. The left and right channels are mixed together by professional internal circuits, and the components of the left and right channels arenot lost. After being interconnectedbyTWS, the 2 soundsystem instantly becomes a left and right channel stereosoundsystem, achieving true wireless connection. BluetoothCompatibleversion: BT5.3 15m Audioinput: BT5.3+Aux+UDisk+USB sound card Audiooutput: 30W mono Adapted power supply: DC9-24V 3A cannot be connectedto ACpower Adapted horn: 4-8Ω 5-30W Support MP3WMA WAV FLAC APELossles Format Colour:Black Material:ABS Package Contents: 2x Audio amplifier board module (Delivery is in parts) 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.