features high efficiency and high power.Features:Adopts high quality TPA3116 digital amplifier chip.Sound quality is very good, high efficiency and amplifying power.50W*2+100W 2.1 channels(left/right channel and subwoofer channel), high efficiency and low-heat.Powered by DC 12-26V, wide input voltage.User can adjust the volume by themselves easily.Applicable speaker impedance: 4-8 ohm.Just connect the power supply and loudspeaker box, enjoy the pure digital music!