This is a level instrument, 16 lines for finer positioning, with 3 self-leveling system, flexibility and stability. With vertical and horizontal laserlines, convenience to use. It is perfect for a variety of uses, including flooring, tile layout, paneling, wallpapering, stenciling, wainscoting, finish carpentry, socket and switch layout, wall stud layout and partition installatio. Features: Adopts optical glass, fine transmission, with clearly laser light. 16 lines for finer positioning, with self-leveling system, flexibility and stability. Equipped with self-test calibration function, 3 automatic leveling, but if the angle is over 3, the laser light will keep blinking and also has beep sound to reminding you to reset them on a flat ground. The magnetic-damping compensation system ensures quick levelling time. Two touching buttons design, one V button, one H/OUT button, the button is wear resistant, with high sensitive to switch the line mode quickly, and with comfortable hand feeling. 1/4" screw size rotation base for easy connection, it also can be used with tripod by it's 5/8inch thread to adjust the working height of the machine and work with 180 oblique line. Comes with one T-type wall mounting bracket, 7mm wall mounted distance, general for indoor and outdoor use. The laser level lift bracket, height adjustable, anti-slip texture design for increasing friction, more stable placement. Comes with one remote controller, "V"=vertical line, "H"=horizontal line, and you can adjust the quantity of laser lines easily by press the "+"or "-" button. Scanning QR code on the back of remote controller to download mobilephone APP, convenient to control the level machine(the voice control function is not supported). Comes with the carrying bag, easy to carry, 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: 2 * rechargeable lithium battery, 3.7V, 2400mAh (included, you will find there are two batteries inside if disassemble it) Laser ray: 360* 4, 16 lines(4D) Wavelength: green light 520nm Horizontal/vertical accuracy: 1mm/7m Self-levelling-range: 3 Waterproof grade: IP54 Working distance: 10m Green light working temperature: -5 to50