ST-838 2.1 Channel Mini Amplifier, RMS 20Wx2 + 40W Sub Output Audio Amp for Passive Speakers & Desktop Audio Compact Stereo Receiver with RCA/AUX DC 12V Power Adapter Included

[Mini Size but Powerful] Don't be fooled by its size it will give your entertainment system a serious boost. With 2.1 channel output RMS 20W×2 (L/R) + 40W (subwoofer), it can drive most home/car/marine/outdoor passive speakers and subwoofers, with excellent sound. Low distortion and acoustically accurate reproduction of music that sounds smooth and full. [Bass & Treble & Sub Vol Control] Designed with main volume, treble and bass control knobs for more delicate adjustment of the sound, offering much fun and high playability. Besides main volume, treble and bass control, a sub volume control is specially designed.

They allow you to control the volume of the passive subwoofer and two passive speakers separately as you. [RCA & AUX Inputs] With standard stereo RCA and 3.5 mm AUX inputs, it can be compatible with various devices, such as mobile phone, MP3, MP4, CD player, TV, computer, etc. Just enjoy your music the way you want to. Besides, there's a little blue woofer alert that turns on when the woofer is beating. [Portable
& Convenient] Mini Size: 5.9 x 3.6 x 1.4" / 15x 9.1 x 3.7 cm; amplifier weight: 0.66 pounds / 0.3 kg. Compact design with exquisite appearance; the matt silver case looks fashionable and durable. The unique structure design is easy to install in car, marine, RV, golf cart or home, which saves space and is convenient to operate. [Great Value Choice] The package comes with a DC 12V 3A adapter valued at over $10, which makes purchasing this ST-838 amplifier a very good deal. You don't have to find an adapter with a 5.5 x 2.5 mm plug in your pile of old power adapters, or pay for another one