The Thermacell Mosquito Zone Repellent 2 Repeller Perimeter system is a portable and effective solution for mosquito prevention during outdoor activities. With an EPA registration number 71910-2, these cartridges provide 12 hours of repellent power. The black plastic design allows for easy setup and use in outdoor settings, perfect for camping and hiking trips. Made in Thailand, this repellent system from Thermacell is a reliable option for keeping mosquitoes at bay while enjoying the great outdoors.