The GoPower Overnighter is a compact universal battery that keeps you going for over a day and is capable of charging your tablet, smartphone and other USB based devices through the USB output. The GoPower Overnighter is part of the Duracell Powermat Wireless Charging Collection. Its compact design and flexibility make it perfect for travel or busy days on the go. To charge devices such as tablets, simply connect your USB compatible devices to the high output USB port (up to 2.1A) and press the copper power button to begin charging. The GoPower Overnighter features two ways to recharge. Simply place the GoPower Overnighter on any PowerMat surface to recharge wirelessly. Or charge via the included USB cable to connect the battery to any works with iPhone type plug with a USB port or to your computer. Duracell Powermat products are compatible with the PMA (Power Matters Alliance) standard. PMA is the standard for smart and environmental wireless power backed by AT&T, Starbucks, P&G, Powermat and dozens of global leaders, and deployed at leading venues including in select Delta Air Terminals and Delta Sky Clubs, Westfield Malls, at Madison Square Garden, Barclays Center and in Jay Z's 40/40 Club. Duracell Powermat. TakeCharge. Be Empowered.