Thermacell Er136 Repellent Refillrechargeable Refills Create A 20-foot Zone Of Protection Against Mosquitoes – Our Largest Zone Yet. This Cartridge Is Compatible With All Thermacell Rechargeable Repellers.features: Each Scent-free Refills Provide 40 Hours Of On-demand, Continuous Mosquito Protection. Portable And Tsa-compliant. Thermacell Rechargeable Devices Are Powered By A Lithium-ion Battery. Heat Activates The Repellent To Provide Maximum Protection In 15 Minutes. Portable And Tsa-compliant. Repel Mosquitoes Without Deet Sprays Or Lotions On Your Skin. No Smoke, Flames, Or Strong Scents Like Citronella. Independently Tested And Epa-reviewed For Safety &Amp; Effectiveness. People And Pet Friendly. Backed By The Thermacell Guarantee. See Packaging For Details.