Stereo amplifier Booster 2.1 15Wx2 + 20Wx1 Lepy LP838 Features Model: LP838 Brand: Lepy Power supply: DC12V-14.4V (power supply not included)  Current: greater than or equal to 3A Impedance: 4-8 Ohm Nominal frequency: 20HZ-20KHZ Ingrewssi audio:  RCA / AUX Shell material: aluminum alloy Power: RMS 15W X 2CH SUBWoofer20WX1CH Configuration: 2.1 Signal-to-noise ratio: 75dB Dimensions: 15.4x12.9x3.9 cm Input impedance: 47KOhm Input sensitivity: 270mV Functions: MP3 player