This is 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. Adopts optical , fine transmission, with clear laser light. Push button design, push left to open it, push right to close it. 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. Equipped with LCD display, with battery remaining electricity display function for you to recharge the battery in time. The magnetic-damping compensation system ensures quick leveling time. 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. 1/4" thread size on the bottom for easy connection, it can be used with tripod to adjust the working height of the machine. The T-shape bracket has 360 rotatable base, and equipped with spirit-bubble, can make the machine quickly find the target(1/4" screw size). With 7mm wall mounted distance, general for indoor and outdoor use. Equipped with window clip holder for works with wall-mounted bracket. Comes with one remote control, A=vertical line, B=horizontal line. The remote controller also has laser light brightness adjustable function, long press A to light up and long press B to dim it. The button is wear resistant, with high sensitive to switch the line mode quickly, and with comfortable hand feeling. 1/4" to 5/8" thread adapter for easy connection, it can be used with 5/8" thread tripod to adjust the working height of the machine. Easy to carry with the carrying bag, providing quick and convenient mobility and storage. Note: The laser output maker is located on the output hole. Do not stare directly at the laser light. Do not disassemble the instrument. This instrument meets the laser radiation safety rating standard. Specifications: Main material: plastics metal Battery: 2 * rechargeable battery, 3.7V, 1500mAh (included, you will find there are two 18650 batteries inside if disassemble one) Laser ray: 360*4, 16lines(40) Display: LCD display Wavelength: Green light 532nm Laser lines accuracy: 0.2mm/10m 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