Turn it up loud! This versatile desktop/travel speaker looks awesome and is the perfect companion to your favorite rockin tunes. With a premium-grade 5W speaker driver and Bass and Treble controls, sound quality is unmatched for a speaker this size. Connect to your mp3 player or computer with the included cable, and get power from either batteries or USB. * Included: Mini Amplifier Speaker, audio cable, USB cable * Requires: 3 AA batteries, optional but not included # adjustable Bass, Treble and Volume dials to really get the best from your music. # Can be used as both an MP3 speaker (or any music player with the provided 3.5mm jack cable) or a computer speaker. Size: 12.5 x 10 x 9cm.