Features: Experience high fidelitymusic with the ZK-301B BT5.3 Amplifier Board,perfect for audiophiles seeking powerful and clear sound. This amplifier board features exceptionalperformance, delivering distortion freeaudio output Supporting the operation of the box 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 independent soundsystem instantly becomes a left and right channel stereosoundsystem, achieving true wireless connection. Specifications: Item: Mono 30W BT5.3 AudioAmplifier Board 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: 4-8 5-30W Size:approx 71x51x46mm/2.8x2.01x1.81in Support MP3WMA WAV FLAC APELossles Format Note: Due to the light and screen setting difference, the item color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package includes: 1PC Mono 30W BT5.3 AudioAmplifier Board