With drop shock protection, Military Grade design and IP67 certification- This Power bank is Built to Last. High Power output power bank with 2.1 Amp output to quickly charge all of your USB powered devices. That's 4 times faster than traditional USB batteries. Waterproof - IP67 certified waterproof (when cap is closed), IP65 water resistant (when cap is opened). High capacity 7800 mAH rechargeable high quality grade A lithium battery - recharges faster, last longer.