Rechargeable Repellent Refills are designed to keep your devices running efficiently for long-lasting protection. Offering a 20 feet zone of defense against mosquitoes our largest zone yet they ensure you're always prepared. Keep extra cartridges and mats handy in your tent, backpack, garage or tackle box, so you're ready whenever you need them. Portable and TSA-compliant, these refills are also ideal for air travel. Please note: These refills are compatible only with Thermacell Rechargeable Repellers. Stay protected, no matter where your adventure takes you.