Enjoy reliable mosquito protection with the Thermacell Rechargeable Refills, designed to create a powerful 20-foot zone of defense. These scent-free cartridges are compatible with all Thermacell rechargeable repellers and use heat-activated technology to reach full effectiveness in just 15 minutes. Each refill provides hours of continuous protection without sprays, lotions, smoke, or flames - making it people- and pet-friendly. Compact, TSA-compliant, and easy to carry, Thermacell refills feature a proprietary EPA-reviewed formula proven to repel even the toughest mosquitoes, including those that may carry West Nile, Zika, or Encephalitis.