DON'T FEAR THE WIND! Operational down to 10 degrees Fahrenheit. External Battery (rechargeable) Three Levels of heat (high = 4 hrs) (med = 5-1/2 hrs) ( low = 7 hrs) DRIFTER is operational down to 10 degrees Fahrenheit. Patented duel heating system. Magnetic case allows attachment to ladder stands. Silicone padding dampens plastic to metal noises. Easily allows attachment of para cord or carabiner. Burns compatible mosquito repellent pads