Heated Vest VEST Heated Vest with Carbon Fiber Heating Element and 12V Lithium-ion Battery Key Specifications/Special Features: Specifications of heated vest: Heated vest Fabric: 100% polar fleece Lining: 100% nylon 210T taffeta with water repellent Color: black Sizes: S, M, L, XL Electrical specifications: Battery: 12V, 2,400mAh Lithium-ion battery Dimensions: 9.3 x 8.0 x2.5cm Weight: 202g With on/off switch, 5 ranges temperature control Temperature range: 38 to 67 degrees C (measured at the thermostat) Battery enduring time: 3 to 12 hours Charging transformer: Input: 110 or 220V AC Output: 12V DC CE, UL-approved 12V cigarette plug adapter: Input: 12V DC Output: 12V DC, 1A Carbon fiber heating element: Supply: 12V DC, 11W The far infrared heating element is made by 60,000 pieces of adjacent micrometer carbon fiber with membrane CE and FCC approved