Brand ChengSheng Quantity 1 piece(s) Color Blue + silver Material Aluminum alloy Amplifier Class A Function MP3 Player Media Playback supported MP3 Singnal Compatible USB SD MP3 Frequency response 20~20000 Hz Number of Channels 2 Input Power 20+20W Peak Power Output 50+50W RMS Power Output 20+20W Input Sensitivity 220MV 47K lnput Impedance 4~16Kohm Signal To Noise Ratio 85 dB Slewing Rate 85% Input Voltage 12V Speaker Impedance 4ohms / 2 ohms THD (Total Harmonic Distortion) Interface SD/MMC/MS + USB + L + R + 3.5 mm Memory Card Max. Capacity 16GB Remote Control Yes Application Car motorcycle golf cart and other places Packing List 1 x Amplifier 1 x Remote controller (1 x CR2025 included)