Venture Heated Clothing 333 MED White Medium Heated Nylon Ladies Vest with 604 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 604B with separate controller (Good for 500 Charges) Heating temperature is up to 132 degrees Fahrenheit +/- 5 degrees Fahrenheit at 32 Fahrenheit Comes with a temperature controller with high, medium and low settings