The Thermacell Mosquito Repeller Patio Shield in Midnight Blue creates a 15 ft zone of protection against mosquitoes. Powered by batteries and made of plastic, this outdoor repellent is safe for pets and is odorless. With a 12-hour prevention period, this EPA-registered device is perfect for camping, hiking, and other outdoor activities to keep away pesky insects. The refill pack ensures long-lasting use for enjoying a mosquito-free outdoor experience.