1,All aluminium alloy shell, to eliminate all kinds of electromagnetic interference. 2,High‑power audio amplifier chip, 15W x 2 RMS power output. 2.1CH, Low distortion. 3,RCA andamp 3.5mm audio input. Supports all kinds of audio input, such as mobile phones, DVD players, computers, MP3 or MP4, etc. 4,Great for use on your vehicle or your home. Smart, lightweight aluminum casing. 5,Two pairs of speaker output clips, easy to wire. Allows for full control of volume, treble and bass output. Description: If you have connected a navigation system, MP3 or other stereo audio signal source in your car or motorcycle, you can use this HiFi amplifier to enjoy wonderful sound. It also has jacks for plugging in MP3, MP4 or CD players. In addition, this aluminum alloy power amplifier has the characteristics of small distortion and compact size, which is very suitable for use in your carrier or at home. The product is 2.1 channel output. It is also suitable for 2.1 channel subwoofer passive multimedia computer speakers and bookshelf speakers. Features: All aluminium alloy shell, to eliminate all kinds of electromagnetic interference. High-power audio amplifier chip, 15W x 2 RMS power output. 2.1CH, Low distortion. RCA and 3.5mm audio input. Supports all kinds of audio input, such as mobile phones, DVD players, computers, MP3 or MP4, etc. Great for use on your vehicle or your home. Smart, lightweight aluminum casing. Two pairs of speaker output clips, easy to wire. Allows for full control of volume, treble and bass output. 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 alloy Frequency: 20Hz-20KHz Distortion: <0.4 percent S or N: >75dB Output power: RMS 15W x 2CH and 20W x 1 Input: DC12-14.4V  ≥3A Size: Approx. 15.4 x 12.9 x 3.9cm or 6.1 x 5.1 x 1.5inch Color: Black, Silver (Optional) Package weight: approx. 310g Package List: 1 x Power Amplifier 1 x User Manual​ 1 x Power Amplifier 1 x User Manual Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.