This is the most realistic looking and powerful cell phone stun gun on the market today. It will provide you with the element of surprise if you need to defend yourself. Also, with the built in LED flashlight you will never be left in the dark again. With its slender, compact size (less than 4 inches tall) it provides discrete protection and a convenient flashlight. To prevent accidental discharge it has two levels of safety. A stylish holster is included for easy carrying, or just slip it into a purse or pocket. Dimensions are three and thirteen-sixteen inchesx one and seven-eight inches x seven-eight inches. As with all high quality Streetwise Stun Guns this unit comes with a lifetime warranty. It operates on three (3) CR2 batteries (not included). The CR2 battery is a common photo battery available from most retail stores.