Powerocks - Magicstick 2800mAh Green Universal Extended Battery Large capacity 2800mAh portable battery keeps your cell phone or smartphone powered on-the-go Smart, fashionable and convenient for traveling Compatible with iPhone, Blackberry and other portable devices charged via USB cable Recharge the Powerocks Magicstick via the included micro-USB-to-USB cable Smart push-button LED shows charge status. Blue light = 70% - 100% full, Green light = 30% - 70% full, Red light = 1% - 30% full