The Black & Decker BDL120 Manual Laser Level projects a laser line along the wall. Large bubble vials and backlights allow levelling in both horizontal and vertical modes. The unit will rotate 360° on the wall, allowing line generation in any direction. Ideal for installing shelves, hanging curtain rods and blinds, hanging pictures, hanging a series of pictures, and hanging ornamental objects at the same level. Laser Class: 2.Level Accuracy: ±1 mm/m.Visibility: Indoor 3m.Power: 2 x AA batteries (supplied).