This is a level instrument, 2 lines for fine positioning, fine 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: Compact size, lightweight and portable, easy to take out and carry around with you. Adopts optical , fine transmission, with clear laser light. 2 lines for fine positioning, fine flexibility and stability. Push button design, push to left side to entering into alarm mode, push to right side to close it and the laser level will emit slashline while push to the middle position. Two touching buttons design, one V button, and one H button, the horizontal line and vertical line with a clear division. 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. 1/4" thread size on the bottom for easy connection, it can be used with tripod to adjust the working height of the machine. Powered by 2 AA batteries, you should prepare it by yourself. It is perfect for a variety of uses, including flooring, tile layout, paneling, wallpapering, stenciling, wainscoting, finish carpentry,wall stud layout and partition installation. 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 * AA battery (not included) Laser ray: 2 lines Alarm angle: 3