Poweradd Pilot A1 2500mAh Portable Charger Ultra Compact External Battery Pack Pocket-sized, extremely small with size of 2.6*2.5*0.5 inch fits easily into your pocket or bags, perfect for go out. Enough powerful, with 2500mah capacity it is powerful enough to charge your energy hungry cell phone. Comfortable touch feeling, thin and compact become one, in a wonderful touch feeling, smooth like silk touch. Li-ion polymer cell, built-in Li-ion polymer battery ensure compact size and safe use without worry of explosion, please charge it in full before first use. Industry-Leading Warranty: 24 months limited product warranty and 24*7 customer service