Powerful Sound: The BoomBottle features dual 45mm speakers with a built in sub to produce great sound from a small and compact package. The audio sensing EQ will help to give a wonderful sound experience in or outdoors.Magnetic Top and Bottom: Attach the BoomBottle to any flat magnetic surface easily. Your toolbox, car door, bleachers, enjoy some music wherever you go! Attach your smartphone to the top of the unit with a MagicPlate and you are all set! Long Battery Life: The integrated 4,000 mAh li-ion battery is designed to give up to 12 hours of use. Easily recharge the BoomBottle with the included type C USB cable.