Features: It casts horizontal or vertical benchmark lines in working. Its high-accuracy and speedy assures the quality of construction and make the process of construction convenient. Automatic leveling, when the level is not smooth, the light will be out of the frequent flashing warning. IP54 Waterproof and dustproof multiple protection, and shock-proof machine core, durable in use. Use optical glass, low refraction, good light transmission. L base can be affixed to most of metal surface to support you turn the laser level around at 360 degree freely and project lines in any position or angle. This product is widely used in construction and building, such as bricklaying, cutting plates, decoration, etc. Specification Optional Type AK011R (Red Light, Switchable Line) AK011G (Green Light, Non-switchable Line) Laser Unit Arima Osram Expansion Angle H&V: 120° Laser Wavelength 635nm 510nm Working Distance Approx. 20m Approx. 30m Leveling/Compensation Range 4°±1° Leveling/Compensation Time ≤3s Operating Time 12h 4h Working Temperature -10℃~50℃ Store Temperature -20℃~70℃ Battery 2 x AA Battery (NOT included) Thread Interface 1/4inch Weight 407g / 14.3oz Package List: 1 x Laser Level 1 x Bracket Note: Only a laser level and a bracket included, no other stuff. 1、It casts horizontal or vertical benchmark lines in working 2、Its high-accuracy and speedy assures the quality of construction and make the process of construction convenient 3、Automatic leveling, when the level is not smooth, the light will be out of the frequent flashing warning 4、IP54 Waterproof and dustproof multiple protection, and shock-proof machine core, durable in use 5、Use optical glass, low refraction, good light transmission