Specifications: Material: FR4 Power Supply: DC12V~24V Audio Input Sensitivity: 500~800mV Frequency Response Range: 20Hz~20KHz Loudspeaker Impedance: L/R CH loudspeaker 3.5~8 Bass Impedance: 2~8 Maximum Output Power: 50W (left CH) + 50W (right CH) + 100W (bass CH) Module Size: 11.8 * 9.8cm / 4.65 * 3.86in Package Size: 13.5 * 12.5 * 2.5cm / 5.31 * 4.92 * 0.98in Package Weight: Approx. 184g / 6.49oz Features: Uses TPA3116D2 core chip, high amplification efficiency. Adopts 2.1 power amplifier boards, left and right channel volume control, high pitch adjustment and full volume potentiometer. Wide voltage and electricity saving design, efficiency is up to 90%. Adjustable channel stereo, can output the power in 50W (left CH) + 50W (right CH) + 100W (bass CH). Can directly drive L/R CH loudspeaker in 3.5~8, large output power, enough energy and good sounds. With shock protection, there is no crack when power on. Comes with a connecting line.