Update function: new Bluetooth solution, better Bluetooth decoding effect, support TWS true wireless pairing function, support remote firmware update. Treble & Bass and Subwoofer Controls: With subwoofer volume controls, L and R channels Treble & Bass independently controllable. Built-in low-pass filter for subwoofer with sub-frequency control, small simple design practical and powerful. Bluetooth and AUX inputs: compatible with all home audio devices such as smartphones, , MP3, PC, CD players, etc. Enjoy acoustic surround audio with the speaker. Model: TB22 chip:TPA3116D2 Input Mode: Bluetooth Work Voltage: DC 12V-24V(Above 2A) Channel: 2.1 Stereo Output Bluetooth version: Bluetooth 5.1 Bluetooth transmission distance: 10m(If you need to go further, connect the antenna yourself) MAX Power Output: 50W x 2 +100W type:Amplifier Board color:Black :plastic size:121 x 100 x 26mm Package Contents: 1 x TB22 Bluetooth 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.