Battery1inc 15600mah Rechargeable Back up Lithium-polymer Dual USB 3.1a Output Waterproof Portable Phone Battery Pack External Mobile Power Bank Charger for Iphone,ipad,samsung Galaxy and Most Smartphone Black Waterproof Certificate.Rigid and durable build makes the Power bank water proof, dirt proof, and shock proof. The ideal companion for those who enjoy camping, hiking, biking, and many other outdoor activities. Excellent protection,protection against short- circuit, over charging ,over dis-charging,over-current,over-temperature,over-voltage,over-load.4 status LEDs keep you informed of remaining capacity.Dual USB Output ,Charges 2 devices at once. High Capacity 15600mAh Li-Polymer battery, +70 hours talk time Ultra-fast charging iphone and Android Windows Phone , Smartphones up to 2 hours fully charged Slim Compact, portable & stylish design; Easily fits into your bag to provide instant power;Ideal for Long Flights & Journeys without a Plug-Point, Charges Anytime Anywhere !