The Bosch GLL 30 self leveling cross line high power laser Projects two lines, making a cross line projection, for a wide array of level and align uses. This versatility makes it more valuable than a typical line laser. With top notch accuracy and one switch operation, The user’s leveling and alignment tasks are done quickly and correctly. The red-beam laser lines are visible up to 30 ft. The smart pendulum system self levels and indicates out of level condition to help ensure an accurate layout. The pendulum system locks when switched off, to assure secure tool transport. The included mm 2 flexible mounting device provides micro fine height adjustment, and it allows the laser to be clamped on virtually any surface from 1/2 inch to 2 1/4 inch thick, for level lines at any height. This is a perfect angle measurement tool. Includes: (1) GLL 30, (1) mm 2 flexible mounting device, (2) AA batteries. Class IIA laser product, <1Mw power output.