Features: Strong structure, multiple protection, waterproof and dust-proof, shock and fall resistance. High-precision laser light source-, upgraded green light, more accurate, still has a better performance at 5meters away. Singular- operation, lightweight design, improve construction efficiency, free rotate, easy to solve the staircase project. Suitable for all kinds of engineering work: floor laying, wall painting, picture frame installation, wall tile laying, engineering measurement and so on Surface-inclines less or equal to 3, laser level will automatically self level. Surface-inclines more than 3, laser level will fiash continuously to indicate adjustment. Specifications: Material: Plastic Laser Wavelength: 635/515nm Accuracy: 1.5mm/7m Power Supply: 2xAA Batteries are Needed(NOT Included) Working Distance: 15m Indoors Operating Temperature -10 to 50 Application Range: 3 Line Width: 1.54mm Size: Approx. 6.5x5x6.7cm/2.56x1.97x2.64in Note: 2xAA batteries are needed(NOT Included). Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Laser Level