Used and tested by Law Enforcement Agencies worldwide, they are perfect for personal defense because they are very effective, yet nonlethal. The dye marks attacker for positive ID and has an effective range of 8-20 ft., depending on the model. The Eliminator contains 15% Solution and 2 million Scoville heat units. It has been recommended by Law Enforcements agencies to carry these self-defense weapons at all times; walking, jogging, hiking, bicycling, entering/exiting buildings, etc. This product should only be used in a situation where you would be justified to subdue a violent encounter. This particular model offers a superb twist lock by rotating the red tab counterclockwise to the on position. Just simply push it back to the lock position to close.