1. Efficient connection: the transmission distance can reach 15m, and it supports various input modes such as BT, AUX, U disk and USB sound card. 2. Built-in boost circuit: compatible with DC9-24V power supply, especially suitable for outdoor and mobile speakers powered by batteries. 3. Multifunctional key control: play/pause with one key, switch tracks, turn on/off, and enter mode, with simple operation. 4. Powerful box function: two sets of equipment can be combined to create left and right channel stereo, which has strong spatial positioning and is suitable for DIY production. 5. Intelligent protection mechanism: equipped with anti-reverse, over-temperature, over-current, short-circuit and anti-static protection to safe and stable use. Product model: 1001U Product Name: Single Channel 100W BT Amplifier Module with Boost and High/Low Frequency Adjustment Amplifier chip: TPA3116D2 BT version: 5.3 BT transmission distance: 15m Audio input: BT+AUX+u disk +USB sound card. Audio output: mono 100W Applicable power supply: DC9-24V, ≥ 4A (unable to connect AC power supply), suitable for 7.4V, 12V, 21V and other batteries, not suitable for 24V batteries, which cause overvoltage when fully . Compatible speakers: 20-100W, 3-8 Ω Volume adjustment: use the button to adjust the total volume. Click: Play/Pause Double Click: Next Three Click: Enter or Exit T W S Mode Long : Turn Off/Turn On. Color: Black Material: PCB+Metal Package Contents: 1 * 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.