The Thermacell Rechargeable Mosquito Repellent Refills come in a convenient pack of 2, each offering 72 hours of protection against mosquitoes. The liquid formula is specifically designed for outdoor use, and is powered by batteries for easy operation. The blue plastic containers are durable and feature a repellent/deter control method to keep insects at bay. With an EPA registration number of 71910-11, these refill packs are a reliable choice for camping, hiking, and other outdoor activities. Made by Thermacell, a trusted brand, these rechargeable refills are lightweight and compact for on-the-go use. Please see pictures. Payment is due immediately upon listing ending. Sorry no returns or international shipping. Best of luck to all.