Features: New Bluetooth solution, better Bluetooth decoding effect, support for lossless decoding methods such as WMA FLAC APE, TWS true wireless box matching function, and remote firmware update.Stereo volume and subwoofer volume can be adjusted separately, with a wide range of adjustment. The master volume knob has a key function, click to play to pause, double click to the song, triple click to select or cancel the box modeModel: -LT23Function: 2.1 channel 50W+50W+100W, AUX+Bluetooth BT+U disk lossless decoding+USB sound cardtype:Amplifier boardcolor:BlackMaterial:plasticPackage Contents:1 x -LT23 Bluetooth 5.1 AUX Digital Amplifier boardOnly 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.