Looking for a compact, practical gift for employees, business associates or as a promotional giveaway? The Volt 2200 mAh external battery is an excellent choice. With a battery capacity of 2200 mAh, it considerably increases the autonomy of your cell phone or tablet. The external battery charges via the included USB cable, and the indicator light turns blue when fully charged. Made from lightweight, durable aluminum, the Volt external battery is both reliable and elegant.