Coolup Slim One 2000mAh Air Portable Charger external battery charger Power Bank (only 4.5mm, Unibody Aluminum Housing) Card Size Ultra-Slim Design: Rated at 4.5mm depth, COOLUP Slim One 2000mAh is about the same thickness as your name card allowing easy purse stowage. Long Lifespan - polymer battery rated for 1000+ charging cycles for an ultra long lifespan What you Get: COOLUP Slim One 2000mAh External Battery, Flat Micro USB cable, carrying case, user manual, 18-MONTH warranty and 30-DAY money back guarantee. Built-in short-circuit and over-charge protection.Automatically turns OFF when device is fully charged LED battery level indictor means you always know how much power is left inside