Description: 1. Good-efficiency connection: transmission distance up to 15 meters, support Bluetooth, AUX, U disk, USB sound card multiple input methods. 2. Built-in boosting circuit: adapted to DC9-24V power supply, especially suitable for battery-powered outdoor and mobile speakers. 3. Multi-function button control: one button to realize play/pause, switch tracks, switch on/off and enter TWS mode, convenient operation 4. Powerful pair of boxes: two sets of equipment can be combined into left and right channel stereo, strong sense of spatial localization, suitable for DIY production. 5. Intelligent protection mechanism: with anti-reverse, over-temperature, over-current, short-circuit, anti-static protection, to ensure the use of safe and stable. Specification: Product Model: 1001U Product Name: For Mono 100W bluetooth amplifier board module with boost with bass and treble adjustment Qty:2Pcs Amplifier chip: TPA3116D2 Bluetooth version: 5.3 Bluetooth transmission distance: 15 meters Audio input: Bluetooth + AUX + U disk + USB sound card Audio Output: For Mono 100W Adaptable power supply: DC9-24V, 4A (not connect AC), suitable for 7.4V12V21V and other batteries, not suitable for 24V batteries, fully charged will be over-voltage. Applicable speakers: 20-100W, 3-8. Volume adjustment: total volume with button Product size: 99x75x22.8mm Single click: play/pause Double click: next song Three clicks: enter or exit T W S mode Long press: power off/on Protection mechanism: input anti-reverse, over-temperature, over-current, short-circuit, anti-static protection Package included: 2 x Amplifier board (heat sink and knob caps need to be installed by yourself)