Thermacell Repellent Refill E55 Series 36 Hour. These long-lasting refills will keep mosquitoes and other biting insects away for up to 36 hours. This refill is for the E55 model repellent and will work with Thermacell Rechargeable Portable Bug Blowers. Make sure you have a fully charged device. Once you have the four AA batteries plug in the device and begin to enjoy your fresh-brewed coffee fresh baked cookies or fresh mint tea. There's nothing better than the smell of your favorite Thermacell device. The proprietary formula releases bug zapping odors up to five times more strongly than other bug repellents so your guests will not even know you are repelling insects. Specifications for Thermacell Repellent Refill E55 Series 36 Hour: Manufacturer: ThermaCELL Width: 4.5 in Length: 6.5 in Package Contents: Thermacell Repellent Refill E55 Series 36 Hour