To activate the laser please hold one of the buttons for a few seconds. Elevate your precision on the job with the Self-Leveling Cross Line Laser, boasting a 100-foot green beam that ensures visibility and accuracy in a variety of outdoor and indoor applications. This robust tool, designed to withstand the demands of professional use, features a self-levelling mechanism that automatically adjusts to uneven surfaces, providing a seamless laser line for leveling and plumbing tasks. With its durable mixture material construction and weighing a mere 1 pound, the laser level is both sturdy and easy to maneuver, improving efficiency and reducing user fatigue. The multicolor design enhances clarity, while the compact dimensions of 8.6 inches in width and 4.2 inches in height make it suitable for a wide range of projects. Comes with no manual but whether it's for construction or home improvement, this cross-line laser level is engineered to deliver reliable and high-quality performance.