[HIFI & Stereo]High-quality Bluetooth 5.1 dual-channel 50W+50W power amplifier board. With AUX, Bluetooth, U disk, USB sound card a of audio input methods. Active and passive speaker output methods. Note: It is recommended to use a 18V19V power supply with a current of more than 3A. It is not recommended to use 24V and above, it may be burned due to unstable power supply, depending on the quality of the power supply. If driving 4 speakers, the power supply must not 21V[Ultra high performance]Mini amplifier board supports APP control, you can the Bluetooth name and password . The 5.1 Bluetooth version has adjustable prompt tone volume, power prompt tone, volume indication is synchronized with APP, and 8-level brightness can be adjusted. Comes with 10 custom , up to 1023 sound combinations. It can not only display the playlist of the U disk, also shake the phone to change to at will[Super Compatibility]Bluetooth 5.1 amplifier version, higher transmission efficiency, more stable, and transmission distance. In open spaces, the wireless range is up to 15 (49 feet). Can be widely used in devices such as computers, PCs, , smartphones, notebook computers, etc[Safety Protection]The amplifier module has short circuit, overcurrent, overheating and anti-static protection to prevent complete failure. When overloaded, the device reports a fault condition to the processor to itself from damage. The heat sink is to the shell to assist heat dissipation, the bottom ventilation is not sealed, the heat dissipation area is larger, and the heat dissipation is more sufficient[Easy operation] 360-degree rotation to adjust the volume steplessly, cool volume level indication, 8-level brightness . Press and hold for 1 second to turn on/off, clickto play/pause, double-click to switch modes (Bluetooth/USB/AUX)color:Photo colorMaterial:plasticPackage Contents:1 x Amplifier board1 x Screwdriver1 x DC adapterOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.