Lepy LP-V9S Hi-Fi stereo power digital amplifier with USB SD DVD CD FM MP3 This special purchase Lepai ST-based mini audio amplifier is ideal for both home and car audio Uses the ST IC for low distortion,acoustically accurate reproduction of music Input power:DC10-14.4V; Output power:20w2 RMS Speaker impedance: 4-8 ; Frequency response:20Hz-20Khz Total harmonic distortion:  80dB