BT transmission distance: 15m Audio input: BT+AUX+USB drive+USB 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 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 press 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, with multiple gameplay options. Product size:Amplifier board 122x110x27mm, karaoke board 100x44x14.7mm Product weight:Net weight 331g 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.