The Ronin R-4020 10,000mAh Powerbank is built for those who need performance in a pocket-sized form. With its high-density lithium battery, this powerbank delivers fast and stable charging to all your USB-powered devices including smartphones, tablets, earbuds, and more. Its dual USB output ports allow you to charge two devices at once, while its intelligent protection system keeps your devices safe from overcharging, overheating, and short-circuits.