Appliance is lightweight, portable, no open flame Repellent provides a shield from mosquitoes and other pesky insects Repels up to 98% of mosquitoes, black flies and sand flies Repellent provides 15 x 15 ft bug-free zone; odor free and undetectable to animals Holster is no-hands way to transport and secure ThermaCELL Appliances New 360-degree rotating clip makes attaching Appliance to gear a breeze Side pouches on Holster storing refills feature silent elastic closures / Water-resistant Holster secures to most anything, including belt, packs, fences, branches, etc. All ThermaCELL models use the same refills Each refill cartridge lasts up to 12 hours, and each mat lasts up to 4 hours