This magnetic laser guide for band saw or drill can be mounted magnetically to the side of your machine to show the cutting path on a band saw or show you where the drill bit will touch down on the work piece on a drill press taking away any of the guess work or uncertainty. Great for helping to line up your cuts and holes while increasing efficiency and production at the same time. Can also be mounted permanently using the supplied hardware (will have to drill holes in machine casing). For increased accuracy you can use two units one on either side of the drill press or band saw so that the lasers intersect providing increased accuracy. Please note that it comes with one laser as two units would be required to make a crosshair. Unit does not come with batteries.