This 1/2 oz. Streetwise 18 pepper spray comes disguised as a black pen with a lid as a safety cap, which allows you to take it anywhere and gives you the element of surprise when being attacked. Our pepper spray includes UV marking dye, is 46% stronger than competing brands, derived from over 4 Million SHU**, and independent laboratory heat rating certified. It instantly repels an attacker, incapacitating them for up to 45 minutes. Covered under a year warranty. Streetwise 18 Pepper Spray has a CHR of over 180,000 SHU (1.19 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 Streetwise 18 over 46% hotter than the competition!