Avido World's Thinnest 4000mAh 2.1Amp Output Portable Ultra-Slim Power Bank Charger/External USB Battery Power Pack for Samsung phones and all USB-charged devices [Retail Packaging] - Silver HIGH CAPACITY - 4000mAh of capacity provides your device with an extended charge. Input: DC 5.0V, 1A. Output 5.0V, 2.1A WORLD'S THINNEST - And we mean it! It's just .25" and fits slim in your pocket. Only 4.8in x 2.5in x .25in and it weighs only 4.8 ounces EASY TO USE - Just plug in your device, hit the "On" button, and your device begins charging. To turn off the power bank, simply disconnect the USB cable or device, and the unit automatically powers down LED INDICATOR LIGHTS - Power LED's on the device keep you informed about the current battery level. This includes 100%, 70%, and 30% INCLUDED: Avido 4000mAh External Battery, Micro USB Cable, Manual