The Proxpedition 72-Hour Doe Deer Pheromones are designed to indicate the presence of a female deer over an extended period of 72 hours. The scent is at its maximum of 100% during the first 36 hours and gradually diminishes thereafter. Each set includes 2 pheromone vials, 2 activators, and 2 pads. To use them, pour one vial into the activator, mix, and then pour the mixture onto a pad. Place the pad where you want to attract the game. This is an effective method to stimulate male interest over an extended period, thereby increasing your chances of success in deer hunting.