Self-leveling cross line laser to +0.3 mm/m in leveling applications, Self-leveling up to 4 degrees surface angle with automatic out of level indication, marks a leveled line in seconds, 2 button operation and low battery indication, Built in magnetic pivot bracket mounts easily on metal surfaces, Over molded housing and thick glass protects the toll and helps maintain calibration under job site conditions, includes 3 x AA batteries, Kit box protects units