OFF!&reg; Clip-On&trade; Mosquito Repellent Refills (2 refills) No Skin Application OFF! Clip-On Mosquito Repellent provides protection without putting anything on your skin. No spray, no mess. Easy to Use Whether you clip it on, or set it next to you, protection is just a click away. The unit also contains a rotating clip for additional comfort. 31.2% Metofluthrin Formulated with 31.2% Metofluthrinprovides up to 12 hours of protection against mosquitoes. Use each refill within 14 days of opening.