Mobile Warming Classic Heated Jacket - Large/Gunmetal Windshark four-way stretch highbreathable, waterproof fabric Three heating panels lined withsteel alloy fiber elements Optimum placement with twopanels on the chest and oneon the back Includes one 7.4V 2.2Ahrechargeable lithium-ionbattery and charger Battery features built-in four- level thermo-regulating controls