The Thermacell Mosquito Repellent Patio Shield is a powerful outdoor device that creates a 20 ft zone of protection against mosquitoes. With a battery power source, this black repeller device is effective for up to 12 hours of prevention. The Thermacell brand is trusted for its scent-free insect repellent technology, featuring a rechargeable design that does not require any spraying. Perfect for camping, hiking, and other outdoor activities, this pair of Thermacell Patio Shield units is a must-have for enjoying a mosquito-free experience in nature. 2 Brand new in manufacturer packaging. Item(s) typically ship within one to two business days of your order. Thank you for your business.