Johnson's Laser Mouse is a compact and convenient leveling tool that projects a laser line up to 30 feet. Its integrated horizontal and vertical leveling vials make it easy to find level or plumb. And its SuperStic adhesive system adheres to any surface without leaving marks or holes and is reusable - making it the perfect hands-free tool for one-man jobs. The Laser Mouse comes with reusable SuperStic adhesive strip, (2) AA alkaline batteries, and a protective carrying pouch, so you'll have everything you need to get up and running.