The Mosquito Repellent Appliance is convenient to carry. Repels up to 98% of mosquitoes, effective against black flies, no-see-ums and other flying insects. Creates a 15 x 15-foot zone of bug-free comfort. Does not contain DEET and has no open flames. The Appliance Holster is easy to buckle or clip on ThermaCELL® repellent. Holsters fit all standard-size ThermaCELL Mosquito Repellent Appliances.