Ansai Mobile Warming Men's Classic Heated Jacket - XL/Gunmetal Grey Windshark 4-way stretch high breathable, waterproof fabric Three heating panels lined with steel alloy fiber elements Optimum placement with two panels on the chest and one on the back Includes one 7.4V 2.2Ah rechargeable lithium-ion battery and charger,Battery features built-in four-level thermo-regulating controls Reaches a maximum surface temperature of 135F at full power