Update function: new Bluetooth solution, better Bluetooth decoding effect, support TWS true wireless pairing function, support remote firmware update.Treble & and Subwoofer Controls: With subwoofer volume controls, L and R channels Treble & independently controllable. Built-in low-pass filter for subwoofer with sub-frequency control, small simple compact design but practical and powerful.Bluetooth and AUX inputs: almost compatible with all home audio devices such as smartphones, , MP3, PC, CD players, etc. Enjoy acoustic surround audio with the speaker.Model: -TB22Name: 2.1 channel 50W+50W+100W tweeter subwoofer adjustment bluetooth audio amplifier amplifier chip: TPA3116D2Bluetooth version: 5.1Bluetooth transmission distance: 10 meters (if you need a longer distance, please connect an external antenna yourself)Audio input: Bluetooth+AUXAudio output: left channel 50W + right channel 50W + subwoofer 100WAdapter supply: DC12-24V, greater than equal 7A (can not be connected to AC)Adapter speakers: left and right channels 20-50W, 4-8ohm; subwoofer 20-100W, 4-8ohmVolume adjustment: the master volume, stereo volume, and subwoofer volume can be adjusted separately, with a wide range of adjustment; master volume with buttons Single click: play/pause; double click: the song; triple click: select or cancel box matching modeProtection mechanism: over temperature, over current, short circuit, anti-static protectionFeatures: 1. Support Wuzhi Audio APP. Modify the bluetooth name, password setting, volume adjustment of prompt tone, on/off prompt tone, sleep aid, firmware upgrade, etc. 2. Box pairing function, the true wireless function enables two sets of speakers to be combined into left and right channel pairing boxes, with a stronger sense of spatial positioning.Product size: 121x100x26mmColour:blackMaterial:PCB+MetalPackage Contents:1 x -TB22 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.