Features: Equippedwith 2 self-leveling(plumb leveling) system, with fine flexibility and stability. Equipped with buzzing alarm function, it will at inclination of 2, and tilt 2 automatic leveling. There are two modes: interior and exterior, general for indoor and outdoor use. Three buttons design, one oblique button, one horizontal line button and one vertical line button, with a clear division. The button is wear resistant, anti-skid, with high sensitive to switch the line mode quickly, and with comfortable hand feeling. 3 operating modes available, horizontal, vertical+right angle(vertical)+plumb point(floor), right angle(vertical)+horizontal, you can choose according to your demands. It is perfect for a variety of uses, including flooring, tile layout, paneling, wallpapering, stenciling, wainscoting, finish carpentry, switch layout, wall stud layout and partition installation. The thickened 360 rotatable metal base with fine tuning knob can provides stable support and it is shockproof and shatter-proof. W 5/8 mounting thread for connecting to tripod. Easy to carry with the carrying bag and carrying-strap, providing quick and convenient mobility and storage. Note: Please do not let the laser line shoot to your eyes directly.