This is a mini 2 channel HiFi stereo audio power amplifier for cars, motorcycles, boats, MP3, and so on. The power amplifier with bass, treble & volume control in small size is easy to install and use. Order it and enjoy music. Features: All aluminium alloy shell, to eliminate all kinds of electromagnetic interference. Using high-power audio amplifier chip, the output power is 30Wx2RMS. RCA & 3.5mm audio input. Supports all kinds of audio input, such as mobile phones, DVD players, computers, MP3/MP4, etc. Two pairs of speaker output clips, easy to wire. Support high & low frequency adjustment. Tone / Direct switch allows customized listening via separate bass and treble adjustments or original audio source signal to be passed through without enhancement. Specifications: Input impedance: 47Kohm Speaker impedance: 4 - 8 ohms Compatibility: Compatible with mobile phone, MP3, computer Volume control: Support Connection: Wired Interface: 3.5mm audio jack, RCA input port Audio Source: Electronic devices with 3.5mm plug Material: Aluminum Frequency: 20Hz-20KHz Distortion: < 0.4% S / N: >80dB Frequency response: 20Hz ~ 20KHz Output power: RMS 30W x 2CH Input: 12-13.5V DC ≥3A Size: Approx. 14 x 9 x 4.1cm / 5.5 x 3.5 x 1.6inch Color: Black Package weight: 289g Package List: 1 x Power Amplifier 1 x User Manual .