Ryobi ELL1002 Air Grip Compact Laser Level with Tripod Mounting and Corner Rounding Capability (AAA Batteries Included) VACUUM SUCTION: The AAA powered miniature air compressor will keep this sealed to your smooth, non-textured walls without the need of tacks, nails, or other marring adhesives PROJECTS AROUND CORNERS: This feature is perfect for when you need to put up a shelving unit that wraps around a room. Put the Air Grip Laser Level on a wall, and the laser will beam straight ahead, and cut at a perfect 90 degree angle, pending proper setup TRIPOD MOUNTING: You can keep this mounted onto a tripod, giving you improved versatility for a number of household and professional jobs 30 FT DISTANCE: You can keep the tool away from your project, preventing it from cluttering up your work, thanks to the 30 foot projecting distance from the powerful laser AAA BATTERIES INCLUDED