This 2 oz. Police Force 23 pepper spray has a very unique safety mechanism. The top flips up and with a push of your finger, the spray is released. This safety lock makes it impossible for the pepper spray to go off when not in use. With a safety lock as well. Police Force 23 Pepper Spray has a CHR of over 230,000 SHU (1.47% Total Capsaicinoids) making it one of the hottest, most effective self-defense sprays on the market. For comparison, the independent laboratory tested competing brands. They found the average heat rating to be 123,000 SHU, making Police Force 23 over 87% hotter than the competition!