1. Versatile 2in1 Laser Tape Measure: 5m tape measure 40m laser measurement, with a measurement accuracy of ± 2mm; Continuous measurement requires only moving the device within an effective range to obtain accurate results. The dual photosensitive aperture significantly improves the stability of measurement. 2. Powerful and Rich Functions: You can switch between different units, such as meters/feet/inches, to meet your different habits; The 40m laser rangefinder is designed for longdistance measurement. The instrument has various measurement functions, including single/continuous measurement, area measurement, volume measurement and Pythagorean measurement. 3. USB Rechargeable: Equipped with a 180mAh rechargeable lithium battery, it has a longer lifespan and can be used continuously for 5 hours at maximum power. USB is rechargeable and can be recycled, saving battery life and concerns. 4. Selflocking Device: Equipped with a selflocking device, it automatically locks the current measurement position after pulling out the tape. Press the unlock button, and the tape will automatically rebound, making it r and not injuring hands again.