BRIGHT CROSS LINE LASER WITH HIGH PRECISION: Firecore G20 powerful cross line laser tool easily projects two bright, level and plumb lines at a wide angle of 110 horizontal line and a 110 vertical line to assist your alignment and leveling jobs. With accuracy of 1/17 In. At 23 ft. The indoor working distance is 82 ft. Safety Class II, <1mW Power Output. SELF-LEVELING, MANUAL & PULSE MODE: The Smart Pendulum System that allows this reliable laser tool to self level within 4 automatically while also indicating out of level condition to help ensure an accurate setup, for confidence in a precise job; Long press the top button for 3 seconds, the laser line will be locked in position for use at any angle; To switch to Receiver(Pulse) mode, just single press the top button, then it goes to the receiver mode.