The amazingly portable, lithium-battery powered Tweakers speakers are the perfect solution when you need audio on-the-go. Strikingly loud with an impressive frequency range for such a tiny speaker! Twist it and the top portion expands, giving you extra air space which pumps up the bass. With built-in lithium batteries, you can have hours and hours of music - when you need to charge it, just plug it into your USB port to charge. Clever 'piggy-back' charging cable allows you to listen while you charge, which makes the Tweakers perfect to use with your lap top for movies or music.