The STANLEY STHT77340 - Cubix Cross Line Laser features self leveling cross lines which projects bright horizontal & vertical lines onto flat surfaces for common leveling and alignment applications. This unit also features a QuickLink bracket and mounting system which is designed as a versatile bracket that links into multiple product mounting slots and 1/4" thread clamps on to multiple surfaces. Range 40'/Accuracy +/-5/16". This accurate performance supports common DIY and tradesman applications. It has a locking pendulum and helps to prevent damage to internal components. It boasts of a compact, lightweight design. Uses (2) AA batteries, included.