The ThermaCell appliance heats up its earth-scented insect repellent to keep away mosquitoes and other biting insects while emitting the scent of leaves and dirt to mask human odors. The small, cordless device offers 15-by-15 feet of protection for up to 12 hours per fuel cartridge, and each repellent mat lasts up to 4 hours. It’s easy to refill, has no open flame and is available in several colors. Contact Schawbel Corporation at: (866) 753-3837; thermacell.com.