Powerful & Fully Implemented Emergency Powerbank with Flashing Battery Indicator, Torch Function & 2 Built-In Lithium Batteries (4000Mah & 3.7V) Input 5V-1A Output 5V-2.1A. to Charge Your Smartphone, Tablet, Digital Camera, Gps or Music Carrier. Convenient for Holidays, Business Trips, Festivals, a Day Out & Basically All Those Moments During a Day in Which Your Mobile Device Could Use Some Extra Energy, But There is No Power Outlet Available. the Powercharger 4000 Plus Complies with European Directives & Comes with a USB & Micro USB Charger Cable, A-Quality Lithium Battery & Multilingual Instructions. When You Divide the Power of the Powercharger (Mah) by the Capacity of the Battery in Your Mobile Device (Mah), You Know Approximately What Percentage or How Often You Can Charge Your Mobile Device. Each Piece in a Box. Minimum Quantities Apply.