Get more out of your iPhone or iPod - more music more video more talk more surfing with TuneJuice. More than just a battery extender TuneJuice recharges the battery on your iPhone or iPod using 4 AAA batteries (included in package). Never cut short another conversation or song again; just plug in TuneJuice and your iPhone or iPod battery starts to safely recharge. A must-have for air travel camping road trips or anywhere else you could face the ugly prospect of a dead battery.