DeWalt self leveling 360 degree line and vertical line. Locking pendulum to help prevent damage to internal components. Durable design over-molded housing and IP54 water/debris resistance. Simulates functionality of rotary laser projects bright crossing horizontal and vertical lines. Vertical-adjust base for easy set-up and fine tune adjustments. 1/4 In. and 5/8 In. thread mounts for versatility. Full-time pulse mode allows use with detector maintains full brightness for visibility. Locking pendulum to help prevent damage to internal components. Durable design over-molded housing and IP54 water/debris resistance.