The Thermacell mosquito repellent unit is just what you need to keep mosquitoes and other annoying insects away while hunting or spending time outdoors. The unit works by heating a mat saturated with mosquito repellent, which propels fumes in the air, creating up to a 15' x 15' mosquito free zone. Thermacell is EPA approved and odor-free. This appliance will also repel black flies, no-see-ums and sand flies. Included with the unit are 3 repellent mats and 1 butane cartridge. This kit also includes an All-Purpose LED Swivel Light and an appliance holster. The All-Purpose Swivel Light can be attached to any full-sized mosquito repellant appliance, allowing you to see at night, while providing protection from bothersome insects. The light also features an attached clip allowing for use on hats, belts or most any other outdoor gear. The holster will allow you to clip the unit to any tree branch or even to your body, for easy transportation and protection. The holster also features 2 accessory pockets to hold extra butane and mats.