Dual Operation Modes: The PREXISO green laser level features two modes to suit different tasks. In manual mode, slide the switch to “lock” and hold the power button for 3 seconds to activate. This mode allows you to lock the laser lines at any angle. Perfect for tiling, hanging pictures, carpentry, and wallpaper installation Self-Leveling with LED Indicator: Switch to the “unlock” side to enable self-leveling mode. When the tool is within ±4° of level, it automatically self-levels and the LED indicator stays green. If it exceeds this range, the laser line disappears and the LED turns red. Simply reposition the tool slightly to bring it back into the leveling range Green Laser & Enhanced Visibility: The green laser beam is up to 3 times brighter than red lasers under the same lighting conditions, offering superior visibility with ±8mm/10m accuracy. It projects lines up to 20m, making it ideal for indoor use. Laser Class II, output <1mW Laser Level Tripod: The adjustable tripod extends up to 80 cm for accurate laser placement and folds down to a compact 34 cm for easy storage. Equipped with a standard 1/4" quick-release plate, allowing fast installation and removal of the laser level Portable & Durable: Compact and easy to carry in your pocket or tool bag. The laser level is wrapped in soft rubber for enhanced shock resistance and a comfortable grip, Manufacturer: Hang Zhou Great Star Industrial Co.,LTD