Features: One button operation makes it easy to select crossed lines, horizontal or vertical line. 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 spirit 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 Model: 9011R (Red Light), 9011G (Green Light) Expansion Angle: V130°, V360° Laser Class: Class 2 Laser Wavelength: 510nm±5nm Leveling Accuracy: ±3mm/10m IP Rating: IP54 Battery: 2 x AA Battery (NOT included) Operating Temperature: -10℃~50℃ Storage Temperature: -20℃~70℃ Line Width: 2.5mm Size: Approx. 75 x 75 x 65mm/3 x 3 x2.6in Weight: Approx. 367g / 12.9oz Package List: 1 x Laser Spirit Level 1 x Bracket Note: Only a laser and a bracket, no other stuff included. 1、One button operation makes it easy to select crossed lines, horizontal or vertical line 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