Joway&reg; Jp37 15000mah Power Bank Portable Charger External Battery Pack for Iphone Ipad Samsung Smartphones Tablets - White 2 x USB output: Output current ranges from 5V 1A&2.1A(max 5V / 3.1A total)&lt;b&gt;&lt;br /&gt; JP37-15000mAh can charge 2 devices (2 tablets or 2 smart-phones max) simultaneously and is designed to charge phones and tablets. 2:High capacity: 15000mAh can supply about 800% - 900% of an iPhone 5's battery life or 400%-450% of a Samsung Galaxy S5's battery life, and 4 built-in LED indicators show remain power status. 3:Battery type: Uses import Korea famous Samsung battery, which is both safer and more stable (both the iPad and iPhone use the safer) and will give you 500+ recharge cycles over the course of its life. 4:Protectively designed: With short circuit and over-current protection, 15000mah power bank will automatically shut down when a short circuit or overload occurs. The power bank case is painted anti-flaming oil, more safe & light color. 5:Light and Compact,Stylish & portable: Has an ergonomic design that allows for easy one-handed handling and is perfect for long plane flights and road trips. Carry mobile power wherever you go and charge your devices anytime, anywhere.