They sometimes have specs listed on the sites. My Ego C is about 4 1/2 inches long. My Apollo is a little longer. I wasn't sure about the size at first but they both work so well that the size isn't an issue. Still pocket size. I seriously would try the Apollo, its decent priced, they have everything included and they do offer 30 day money back if you don't like it. They have the standard and Extreme kits as well as the tgo model. I liked the standard after trying others on the market. My smoking habits were not satisfied completely by the standard so I switched to the Ego and TGo and that works great. My girlfriend is happy with the standard, she doesn't smoke much though.