Specification Material: ABS. Size: 190x49x104mm. Color: Yellow. Wavelength: 650-680 NM. Power supply: 3xAA battery.(not include) Package included: 1* 90 degree level.(not include battery) Features Make 90 degrees beam on any surfaces, to install home decorations, woodworking decorations, tiles, etc. Perfect for a variety of uses, including flooring, tile layout, paneling, wallpapering. Perfect for woodworking, tiled or any other work that requires precise alignment. The angle of the line can be changed according to the angle scale. 90 degree level provides accurate alignment of flat or straight. Notes 1. Please allow slight measuring deviation due to manual measurement. 2. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you 3.Please leaving a message before you give the bad feedback, if the products have some problems.Thanks for your understandings.