3-in-1 Measurement: The laser tape measure has a 40m laser, a 5m tape measure, and a 10m 90° cross-line laser measure. It operates on 2 AAA batteries (not included). Multi-function: The digital tape measure supports distance, area, volume, 2-point and 3-point Pythagorean, and continuous measurement modes. It can also perform calculations while measuring distance. Lock: The digital laser tape measure will automatically lock after being pulled out, and there is a retraction button. The weight is very light, with a clip-on design for easy carrying on the belt. Shutoff: The laser tape measure has an automatic shutoff function that turns off the laser after 30 seconds and the entire device after 2 minutes if not in use. Comfort: Thanks to its non-slip rubber coating, it offers a secure and comfortable grip. It is the ideal measuring tool for professionals and DIY enthusiasts.