Thermacell Rechargeable Repellent Refills are compatible with all Thermacell rechargeable repellers including the E-Series and Radius Zone Mosquito Repellers. Thermacell Rechargeable Mosquito Repellers deliver powerful and effective defense against mosquitoes without spray, mess or scent for up to 36 hrs. No chemicals on skin, refills are scent-free and do not contain DEET.