Features: Compact size, lightweight and portable, easy to carry with the case, providing quick and convenient mobility and storage. Adopts optical glass, fine transmission, with clear laser light. Output 2 laser lines separately or simultaneously for finer positioning. Equipped with self-test calibration function, ＜3 automatic leveling, but if the angle is over 3, the laser light will keep blinking to reminding you to reset them on a flat ground. Rotation button design, turn right to open it, turn left to close it. Two button design, with high sensitive to switch the line mode quickly, and with comfortable hand feeling. Long time press the OUT/H button under power-on condition to transmit oblique line. Drop resistance, anti-vibration with multiple protections. Suitable for flooring tile layout, paneling, wallpapering, stenciling, wainscoting, finish carpentry,wall stud layout and partition installation.