Create a 20-foot protection zone using this advanced repellent formula. This refill provides 36-hours of ultimate mosquito protection when used in a Thermacell rechargeable repeller. It is compatible with Thermacell rechargeable repellers, including the E-Series and Radius Zone Mosquito Repellers. Thermacell repellers are ideal for the backyard, poolside, gardening, and outdoor adventure. This refill provides on demand repellent; start and stop as often as you need. Repel mosquitoes without chemicals or sprays on your skin. There are no lotions or DEET to apply; no smoke, flames, or citronella; and it’s not a messy trap or gimmicky sonic. It has been EPA reviewed for safety and effectiveness.