Kinter MA-600 2-Channel Output Digital Power Mini Amplifier AMP with Remote Control + 3A Power Supply + Tera Cloth for FM USB SD CD DVD MP3 Players Input voltage: DC 12V. Frequency response: 20Hz-20KHz. Speaker Impedance: 4-16n. Output power: RMS 20W+20W 1KHz. Harmonic Distortion: 0.05% 4W 1KHz. SNR: 85dB. High control: 12dB10KHz. Bass control: 12dB100Hz. Suitable for FM, SD MMC card, CD, DVD,PC or MP3, etc.