Venture Heated Clothing 556M MED Black Medium Heated Fleece Men's Vest with 603 Rechargeable Power System Heating Panels: Hair thin, micro alloy heating elements - No Coils Heating time is 1.5 to 4+ hours, depending on setting Battery: Rechargeable 603B with separate Tri-Zone Controller (Good for 500 Charges) Heating temperature is up to 132 degrees Fahrenheit +/- 5 degrees Fahrenheit at 32 Fahrenheit Comes with a Tri-Zone controller with high, medium and low settings