Features BioShield technology powered by NeuroRX. Developed by pharmacists with prescription strengths. A proprietary formula of Portland Outdoors. Repels and kills ticks, mosquitos, chiggers, black flies, fleas, and bed bugs. An all-natural formula deet free. Lasts up to 8 hours. Repels and kills insects with NeuroRX. Prescription strength results. All-natural formula. Lasts up to 8 hours.