Ansai Mobile Warming Glasgow Heated Jacket - 3X-Large/Black Windshark 4-way stretch high breathable, waterproof fabric Optimum placement with two panels on the chest and one on the back provide quick warm-up and even distribution of heat where needed most Includes one 7.4volt 2,200mAh rechargeable lithium-ion battery and charger Battery features built-in 4-level thermo-regulating controls Reaches a maximum surface temperature of 135F at full power