Stockwell is the smallest travel speaker made by Marshall today. This portable active stereo speaker weighs just 1.20 kg, which means it will go wherever you want it to. Rechargeable lithium ion batteries are built into the Stockwell, which give it 25 hours of playing time. The handy USB port also allows you to charge your devices when you are on the go.The Stockwell packs a sonic punch, with two 2.25 inches woofers and two Class D amplifiers, making it the loudest speaker in its class. Volume, bass and treble can be adjusted quickly and easily with the retractable analogue control knobs located at the top of the speaker.