The 0.5 oz. Key Chain Model fires a modified liquid stream of irritant up to 8 - 10 feet, expanding to an area approximately 2 - 2 ½ square feet. The unit also has a detachable joint between the weapon and the key chain. It is designed this way so that you can use your keys to open the door with one hand, and have your weapon ready to use in the other hand. This is the model we recommend for women since it's small enough to fit in a purse and conveniently attaches to a key ring. Pepper Spray - Teargas