For mainframes without a low frequency (RCA) output (eg, cassette reader/card reader/CD/VCD/DVD), converting the high frequency output of the horn to a low frequency (RCA) output to a car power amplifier or subwoofer. Convert high-frequency output to low-frequency output, true channel separation, adjustable input sensitivity and high quality. Reasonable design,high-quality electronic components ensure superb load-carrying power, long-term durability and excellent sound quality. A wonderful tool for you to use this amplifier on your car, motorcycle, golf cart and other places, where you need small amplifier in order to have a better listening experience. If you want your audio details to perform well, the sense of hierarchy is more distinct and prominent; choosing it is equivalent to choosing a surprise. Specification: MaterialABS Shell Maximum power40W Size 99 x 65 x 27 mm/ 3.90 x 2.56 x 1.06 inch Package Includes: 1 Piece Car Audio Converter (High to Low Level