The iSound GoSound Squared Speaker connects to any device with a 3.5mm audio output like your smartphone, MP3 player, tablet and more via the 3.5mm audio cable that is attached to the speaker. The GoSound features an ultra-compact and highly portable design to allow you to bring your tunes everywhere. Enjoy the rich bass and crystal clear treble on the go! The GoSound requires (3) AAA batteries to operate (not included).