2800mAh Portable External Power Battery Charger For IPod IPhone 2G/3G/3GS/4G Size: 3.54" x 3.54" x 0.63" (90x62x16mm) Capacity: 2800mAh Input: 500mAh Max 5.3V +-5% Output: 800mAh Max 5.1V +-5% Charge Time: Around 6-8 hours