These units are are the world's smallest stun guns. The Streetwise Mini Stun Gun and the Hot Shot Stun Gun are only 3" long. The Streetwise Stun Pen sizes like a marker and is only 6" long. The design of these incredibly small stun guns were inspired by the need of self defense for both men and women. Women often carry a purse filled with many items like makeup, lipstick, perfume, lotion and more. There isn't extra room for a bulky self defense device. That's where the compact design of these mini stun guns come in handy. These extremely small stun guns will also fit in most men suit's pocket and jean's pocket. For those of you who are always on the go, these mini stun guns would definitely suit your lifestyle. With its compact size, you can easily bring it with you while you go for a walk with your dog, jogging around the park or even going out to the club with your friends. It is an excellent self defense device for both men and women.