Usage Tips:[20W+20W 2CH Output]-- 20W+20W RMS mini amplifier, the max power out can reach to 200W+200W, providing much better sound quality and shocking auditory effects. Comes with 12V 3A power supply, available for 2-10 inches speakers. [Bass & Treble & Volume Adjustment]-- Features crisp responsive buttons for the power switch and rotary knob control for the master volume adjustment. it can be adjusted according to your needs. [Compact Size]-- Made up of aluminum alloy body, with blue LED lights for the large knobs, the compact bookshelf speaker sound amplifier features a mini compact size, easy to bring anywhere it is needed. [Application]-- Compatible with a variety of digital products, it can automaticly search and support FM radio frequency. It's perfect for your karaoke and home theater acoustic sound system and cars, motocycles or boats sound system applications. Colour:black Material:metal Package Contents: 1 x Mini power amplifier 1 x English manual Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.