Lot of 8 Repel Realm Zone Mosquito Repellent Refill Cartridges offer 40 hours of protection against mosquitoes in an outdoor setting per refill for a total of 320 hours of protectionin this bundle deal of 8 refills. The liquid formula is designed to be odorless and non-detrimental to the environment. Made of plastic and featuring a green color, these refill cartridges are easily rechargeable and manufactured in the United States by the trusted brand, Repel Realm. Perfect for camping, hiking, or any outdoor activities, these cartridges are a convenient and effective solution for keeping mosquitoes at bay.