BT transmission distance:15m Audio input:BT+AUX+USB drive+PC sound card+MIC Audio output:Left channel 220W+Right channel 220W+subwoofer 350W Adaptive power supply: DC15-36V, equal 8A (Do not connect to AC) Adaptive speaker:Left and right channels 50-200W, 3-8OHM; Subwoofer 50-300W, 2-8OHM Model:-DAM L1 Name:220W+220W+350W microphone audio integrated machine(Potentiometer lead out type) Amplifier chip:TPA3251D2 BT version:5.0 Dual channel volume adjustment: 1. Background music volume adjustment with multifunctional buttons (click pause, double-click next track, triple tap previous track, long mode switch) 2. MIC volume adjustment Protection mechanism: Input anti reverse, over temperature, over current, short circuit, overload. Characteristic function: Dual microphone input, supports EQ adjustment on the upper computer, can be used independently as a 2.1 amplifier board. Potentiometer parameters: The wire length is 35cm, with 4 single link 10K potentiometers for universal use, and 1 10K potentiometer with a button for main volume. Product size:Amplifier board 103x110x23.7mm, karaoke board 100x44x14.7mm Product weight:Net weight 287g Type:B:With Karaoke Board Colour:Black Material:Metal+Plastic Package Contents: 1 * Audio Amplifier Module 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.