The Stanley SLL360 cross line laser projects 2 laser lines onto the wall, so that your wallpaper or planks are always hung straight. The laser is self-leveling up to an angle of 5 degrees, so that it is automatically level. Handy, because that way you know for sure that the laser lines are straight. The green lines are more visible than red lines, making it easy to perform your work. You have a range of up to 25 meters without a detector. It is possible to place the laser on a tripod (not supplied as standard). The cross line laser works on 4 AA batteries that are supplied as standard.