Adopting TPA3221 chip, audio power core, high efficiency, low power consumption, high-definition sound quality, and comprehensive protection mechanism. Easy to use, tuning of high and low frequencies, more convenient to use. Low loss, using digital amplifier specific inductors for lower losses. Multiple decoding options, supporting Bluetooth audio decoding and USB flash drive decoding. Product Name: Bluetooth Digital Audio Amplifier Power supply: DC12-30V/3A or above Bluetooth version: 5.2 Audio input: Bluetooth+AUX+USB flash drive+USB sound card Bluetooth audio decoding: AAC USB decoding: WAV, FLAC, APE, MP3 Left and Right channel output power: 10W+10W @ 8/12VDC 20W+20W @ 4/12VDC 35W+35W @ 8/24VDC 70W+ 70W@ 4/24VDC 60W+ 60W@ 8/30VDC 100W+ 100W@4/30VDC Note:Due to different production batches, there are differences in printing/appearance, which does not affect use. Colour:Black Material:PCB+Components Package Contents: 1 * Amplifier Board(Potentiometer integrated) 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.