HY 502 FM MP3 Audio Speaker Car Stereo HiFi Amplifier Player ion : This car power amplifier is a 2-channel professional ion al amplifier, suitable for car, motorbike, boat, home use with easy installat ion . Multifunction ion and Convenience, support FM /MP3/ USB /SD MMC Card/DVD/VCD/Audio-in Sel et ed high-power four-channel profession ion al power amplifier integrated circuits, minimal disto rti on strong power. With Bass Tuning/Treble Adjusting Bu tt on and four- Sw itc hing bu tt on Pre-profess ion al l eve l input opera t ion al amplifier IC for circuit design, sound, transp nsp , bright. Filtering and anti-large-c apa city power circuit. Sound LED digital d isp lay DSP sound field pa tt ern of the four. Notice: This amplifier did not include the power adapter(12V 3A) ion : Input Voltage: DC 12V Output Power: RMS 2x20W 1KHz Speaker impedance: 4-8 Ohm FM Radio Frequency Rang: 87.5 108MHz Frequency Response: 20Hz - 20kHz Harmonic Distortion: 85dB High Control: 12dB - 10KHz Bass Control: 12dB - 100Hz The Signal eve : 220MV 47K Size (L x W x H): 152 x 105 x 40mm Material: Aluminum Package Includes: 1x Stereo Amplifier 1x Remote Control 1x User Manual