This unit contains a Class II Laser with 1mW output Simple and Reliable One Button Operation Self Leveling Laser Range 2000ft, Accuracy 3/32 at 100ft Includes Rod Eye 140 Classic Receiver, D-Cell Alkaline Battery Holder and Batteries, Case H. Alerts You if Laser has been Disturbed Ideal for General Construction Outdoor Leveling Tasks with IP67 Dust and Water Protection.