What new disease are mosquitoes carrying this year? It won't matter to you if you're carrying a Thermacell Mosquito Repellent Device. No messy wax. No greasy sprays or lotions. Thermacell Appliances work by heating a mat saturated with a special ingredient from a flower that mosquitoes hate. As the mat is warmed, the skeeter-fighting ingredient is released into the air, offering you a 15' radius of protection. Updates on the original that make it even better. The MR300G is the newest Thermacell portable Mosquito Repeller boasting new and improved features. Its updated streamlined design has a built-in grip for easier handling. And re-designed grill makes for even greater repellent diffusion. A new slide-switch makes for easy one-handed operation. And a new rail system makes it a breeze to integrate with other accessories. New features include: Quiet ignition, re-engineered grill and switch, improved ergonomics, and updated accessory mounting system Creates a 15' mosquito-free zone with no sprays or lotions Repels mosquitoes, black flies and other biting insects Lightweight and portable, no open flame Up to 12 hours of protection from each cartridge, mats last 4 hours each Silent and virtually odorless operation, perfect for hunting Works with all Thermacell repeller mats and refills Includes Appliance, 3 original repeller mats and 1 butane cartridge