Fit & Design: Machine Washable - Gentle Cycle The powerful Tri-Zone heating system includes 3 built-in heating panels, strategically placed on the chest and upper back to warm your core body temperature Crew Neck Design Ultra-fine carbon fiber heating panels Technology: Touch-Button Control Technology (3 settings) 4 LED power indicators display power banks battery life Battery Voltage: 5-Volt Power System: 2 amp Additional Details: One ActionHeat Base Layer Shirt One ActionHeat 5V Power Bank (6000mAh) One USB Charging Kit Heating time: high (red) - 130F 2+ hours Heating time: medium (white) - 110F 3+ Hours Heating time: low (blue) - 90F 4.5+ hours