This LP-2020USB amplifier is an upgrade version of LP-2020A+. It has LCD display and EQ function. Input power: DC12-13.5V 3A Output power:20W*2RMs Speaker Impedance:4-8Ω Frequency response:20Hz-20Khz Total harmonic distortion: < 0.4% SNR: > 80dB Package Included: 1*LP-2020USB Amplifier 1*Remote 1*Power adapter US plug