Features: Left and right vocal channel high and independent adjustment, treble transparent, thick, good performance. Support mobile APP control, can be connected to mobile phone Bluetooth-compatible use, more convenient. The power amplifier board has overheat for protection, circuit for protection, over-voltage and under-voltage for protection. The main knob adopts a rotary encoder to achieve 360° stepless tuning, which makes the hand feel smooth. Long press the switch machine, simple operation. Adopt advanced technology, stable power, fast speed and good use effect. Specifications: Material:ABS Audio Channel:2.1 Channel Power Supply:Above DC5-26V/10A Frequency Domain:20Hz-30KHz Out Power:50W*2(Left Right Channel) ; 100W(Subwoofer) Size: Approx. 9.5 x 8.8 x 2.5 for cm / 3.74 x 3.46 x 0.98 inches Package Includes: 1 Piece 2.1 Channel Stereo Bluetooth-compatible Power Amplifier Board note: Please allow 1-2cm errors due to manual measurement. Because of the different display of each computer, the pictures may not reflect the actual color of the item.