This is a level instrument, 4D 16 lines for finer positioning, with self-leveling system, flexibility and stability. With vertical and horizontal laser lines, convenience to use. It is perfect for a variety of uses, including flooring, tile layout, paneling, wallpapering, stenciling, wainscoting, finish carpentry,wall stud layout and partition installation. Features: 4D 16 lines for finer positioning, with self-leveling system, flexibility and stability. Self-leveling function can conquer small rugged place such as 3, over 3 the laser light will keep blinking to remind you to put it on a flat place. Alarm function beyond the safe range. The magnetic-damping compensation system ensures quick levelling time. 360 rotatable base, and equipped with fine adjustment mechanism, can make the machine quickly find the target. 1/4" screw size for easy connection, it can be used with tripod to adjust the working height of the machine. A 360 horizontal line can be drawn on the wall. Two vertical lines can be drawn on the wall. Leaning function, it can be applied in a leaning position like upstairs building. With 7mm wall mounted distance, general for indoor and outdoor use. Three touching buttons design, one OUTDOOR/Open button, one V button, and one H button, the slashline, horizontal line and vertical line with a clear division. (the laserline is brighter under outdoor mode) Comes with one remote control, A=vertical line, B=horizontal line. Laser light brightness adjustable, long press the A button of the remote controller to turn it up and long press B button to turn it down. The button is wear resistant, with high sensitive to switch the line mode quickly, and with comfortable hand feeling. Easy to carry with the case, providing quick and convenient mobility and storage. Note: Please do not let the laser line shoot to your eyes directly. Specifications:Main material: plastics metal Battery: 1 * rechargeable battery, 3.7V, 3000mAh (included) Laser ray: 360*4, 16lines(40) Angle direction: 4 surface, 8 lines Display: LED display Wavelength: Green light 532nm, 10m both sides, 5m each side Laser lines accuracy: 1mm/8m Self-levelling-range: 3 Alarm angle: 3 Waterproof grade: IP54 Working-range: about 25m in diameter Working time: about 5 hours Green light working temperature: -5 to 50