This portable personal speaker gives you 360º-sound anytime, anywhere and for hours at astonishing volumes. Boomz packs a big punch, yet measures in at just 2 inches tall. It works using the included USB connector or a line-in earphone jack, also included. Boomz plays wirelessly for 4-6 hours with the help of a micro SD card (not included). Power input: USB power adapter cable 5V/1000mA. When life takes you away from an electrical outlet, Offwire products are just the thing to keep you connected by charging smart phones, tablets or other USB-chargeable devices. Conveniently small and surprisingly powerful, these handy batteries easily go wherever you do.