Laser wavelength:635nmAnti-dust Anti-water:IP-54Accuracy:±3/8 /100ft(±1.5mm/5m)Self-Leveling range:±4°Power:3 x AA alkaline batteriesLow voltage indication:Power LED flashingSize:145 x 185 x 50mmWeight:150gUse to :Plumb and Align:Walls，Doors，Frames，Stud Beams，Windows and Skylights;Level Electrical Outlets;Stud and Curtain Wall Plumbing，HVAC，Plumbing， Pipe Installation，etc.Easily Lay Out Right Angles;Establish Diagonals and Footings for Decks， Porches，and patios;Grade Determination;Dry Wall.Package Includes:1 x Laser Level SHAZIXIUTAO