Enjoy the outdoors more with Thermacell Multi-Insect Repellent. Refill any Thermacell fuel-powered Repeller and get 15 feet of mosquito protection and up to 10 feet for black flies and no-see-ums. This Refill kit offers 60 hours of protection against pests so you can make the most of the outdoors. Thermacell Fuel-powered Repeller Refills Includes (15) 4-hour mats and (4) 12-hour fuel cartridges 15-ft. mosquito protection, 10-ft. multi-insect protection 60 hours-worth of protection