Ready to ship The STEM Mosquito & Tick Repellent Spray is an effective solution for outdoor activities, providing up to 8 hours of protection against pesky insects. With an EPA registration number of 4822-564, this aerosol spray is specifically formulated to be used outdoors, making it perfect for camping, hiking, and other outdoor adventures. The picaridin formula in this 6oz 4 pack repels both mosquitoes and ticks, ensuring a bug-free experience while enjoying the great outdoors.