Bosch GPL 3 Self Leveling Laser Level, BlueHighlights: Color : Blue Material : Plastic Accuracy : 1 4 in Number of Beams : 3 beam Width : 5. 5 in Length : 10. 5 in Number of Batteries Required : 3 Batteries Battery Size : AA Battery Self Leveling For Indoor use Batteries Included Accessories Included Unit points up down and front to add squaring to plumb, level and align capabilities One person does the job of two people using manual plumb bob In track design makes unit easy to move, maintains