Powerocks Magicstick 2800mAh Universal Extended Battery - Charcoal 2800mAh portable battery keeps your cell phone or smartphone powered on-the-go Smart, fashionable and convenient for traveling Anodized Aluminum Housing for Durability and Safety Less than 1% Defective Rate Smart push-button LED shows charge status. Blue light = 70% - 100% full, Green light = 30% - 70% full, Red light = 1% - 30% full