The Thermacell R-1 Mosquito Repeller Refill is an effective solution to keep mosquitoes away for up to 12 hours. This 2 pack of spray refills is designed for outdoor use, with an EPA registration number for safety and effectiveness. The Thermacell brand is known for its reliable insect repellents, making this product a must-have for camping and hiking trips. Enjoy a mosquito-free outdoor experience with this Thermacell Mosquito Repellent refill.