Kate Spade New York 4000 mAh Backup Battery Bank - Retail Packaging - Fairmont Stripe (Black / Cream) Uses lithium polymer battery Has 4000mAh to charge an average smartphone approx. 2-3 times Dimensions: 4 x 2.2 x 0.5 inches Weight: 0.22 lbs. Power: high-speed input and 2.1 A output Retail packaging