Sleek and compact, but packing a real punch, the Bump hybrid power pack provides that much needed boost for your handheld electronics when you???re on the trail or on the go. Matching up to modern smart phones and digital music players, the Bump fits easily into your pocket or hooks to your car keys, so you???ll always have that extra boost when you need it. Water resistant housing.Internal rechargeable lithium polymer battery with power gauge and auto shut off. Output: 1000mA/5v (USB 2.0 compatible). Dimensions: 2.1"x 1.5"x 0.5". Wt: less than 1oz.