The First Defense® Inert formulation provides the same functionality and targeting properties as active product duplicating the delivery system for training purposes. The MK-4 will deliver 20-25 short bursts of Inert at an effective range of 10-12 ft. This inert aerosol product utilizes a 360° stream delivery method allowing the aerosol projector to disperse Inert from any angle while providing a target-specific, strong concentrated stream for greater standoff.