Leica R620,REBasic, Alkaline Rugby 620 2000-Feet Self Leveling Horizontal and Manual Single Slope Rotary Laser Kit with Rod Eye Basic Receiver, Yellow This unit contains a Class II Laser with 1mW output Self Leveling, Horizontal or Single Axis Slope Matching up to 8% Range 2,000ft, Accuracy 1/16" at 100ft Includes Rod Eye Basic Receiver, D-Cell Alkaline Battery Holder and Batteries, Case H.I. Alerts You if Laser has been Disturbed Ideal for Concrete Forming, Pad Palcement, Foundations, Footings, Dirt Work with IP67 Rating for Dust and Water