Powers most USB-chargeable devices including smartphones * For an Apple iPhone 4S, 20 min. of charging with a strong fire gives you about 60 min. of talk time * During a full burn, the CampStove can boil 1 liter of water in as little as 4 min. 30 sec. * CampStove weighs about 2 lbs. and is about the same size as a 1-liter Nalgene water bottle * An internal starter battery helps kick-start the fire before the stove begins generating its own power