The Kapro 870G VHX Prolaser VIP projects high visibility green beams, which are better than red beams, as the human eye is 10 times more sensitive to the green colour spectrum so you can see the laser faster and clearer. There is an audio and visual 'out of level' warning and you have the ability to view vertical, horizontal and cross beams at 90 degrees. The answer to working on a dusty site with laser levels, with the level having the highest International Protection (IP) rating against dust ensuring the laser will last. This safe and accurate laser is perfect for any project. Specifications: Level Accuracy 0.3 mm/m.Range: Indoor 30m, Outdoor 60m.Protection Rating: IP65.Input Power: 3 x AA Batteries (supplied) .Tripod Thread: 1/4in.