• Self-Leveling 360 Degree Line Laser with 4 Horizontal Dots • Locking mechanism protects inner pendulum during transportation • Manual mode allows unit to tilt to extreme angles • Self-leveling 360 degree contunuous horizontal laser line with four laser dots at 90 degrees • Self-leveing with visible and audible alarms when beyond leveling range • Laser beam can be set to pulse for use with optional line detector • 40-6637 Includes > Laser, 4 AA alkaline batteries, wall mount bracket, mounting strap, instruction manual with warranty card and a soft-sided carrying case