RESCUE! MDS-R Non-Toxic Mosquito Repellent DecoShield Refill Protects an area up to 300 sq ft for up to 8 days from mosquitoes Infused with all-natural essential oils with an attractive scent Nothing to spray or candles to burn A refill for the RESCUE! DecoShield Non-Toxic Mosquito Repellent Device Made in USA; no poisons or killing agents used