The hardware design is fully functional: multiple interfaces + upgraded chips + slotted heat sink + multi-function volume adjustment button. pair of speakers to form a stereo pair: two amplifier boards form a stereo pair of speakers through technology. Dual-core collaboration, sound quality: Bluetooth chip x TPA3116 digital amplifier, a golden combination of wireless transmission + high-fidelity amplification! Product name: Bluetooth digital audio amplifier board Product model:XY-1001W-D Power supply:DC 9-24V/3A or above Audio source input: Bluetooth/AUX/U disk Bluetooth audio decoding: AAC U disk lossless decoding: WAV FLAC APE MP3 Output power: 10W @ 8/12VDC 20W @ 4/12VDC 35W @ 8/24VDC 70W @ 4/24VDC 100W@ 20/21VDC Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Color:As Shown Material:plastic Package Contents: 1 * Bluetootooth Audio Amplifier Board 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.