Lepy LP-2020A Hi-Fi 2 Ch Output Power Amplifiers Speakers Car stereo Digital AMPFeature: RCA Input 、Can be plug in with Ipod、MP3\/MP4 Mini size easy to installation by DIY without manual、 especially good fit for car、 motorcycle bike、boat、 every where! It has Blue LED light ring round Volume Knob;Bass\/Treble tuning. Aluminum alloy solid case and also easy to distribute the heat.  Specification:   Output Power 2 x 20W 4ohm、 2 x 12W 8ohm   Signal-to-Noise Ratio (SNR) 98dB   Dynamic Range 98dB   IHF-IM Distortion 0.1% 1W、 4ohm   THD Distortion   0.03% 9W、 4ohm   0.1% 10W 4ohm   0.1% 6W 8ohm   10% 23W 4ohm   10% 13W 8ohm   Power Efficiency 81% 20W、 4ohm、 88% 12W、 8ohm   Input Sensitivity 200mV   Audio IN: RCA X1 & 3.5mm earphone jack x 1   Power socket (5.5mm\/2.1mm) x 1   Output   Speaker OUT (Left) x 1 pair (+ \/ -)   Speaker OUT (Right) x 1 pair (+ \/ -)   Power Indicator (Blue LED) x 1   Power Supply input DC 12V~14.6V3A   Dimensions: 140mm x 40mm x 120mm(W*H*D)    Package Included:  1 X Stereo Hi-Fi Audio Amplifier     1 X AC Power Adapter(12V、 3A)