Features ScentDefense technology proprietary to Scent Defense. “3-in-1” technology that kills human odor, repels insects, and attracts deer. Silver Copper Synergy technology works to destroy all odors. NeuroRX kills insects almost instantaneously. NeuroRX is specifically formulated as an attractant using a scent that deer love. NeuroRX was developed by pharmacists with prescription strength results. All natural, deet free.