About this item [Compartment combination] - Combination of 40M and 5M laser distance tape measure, self-locking tape measure, high-end black and white reverse display, the effect is more visible Tape Measure - Accuracy: 1.5mm, tape measure width 17mm, stretchable length 5m. One-click flexible back with magnets; coated nylon cover for total abrasion resistance. Laser Range Finder - Accuracy: 2mm; m/ft/inch switchable; continuous measurement, just move the device within the effective range to get accurate results. The photosensitive double aperture significantly improves the stability of the measurement. Class II laser, two working modes, more convenient for on-site application. USB Charging - Built-in rechargeable lithium battery, longer life, 5 hours continuous use in working condition. maximum power, USB rechargeable, recyclable, reduce battery, save energy, save money and worry. Other functions supported - 1. Manual calibration can automatically adjust the precision of the laser. 2. Switch between forward and backward referencing. 3. The laser automatically turns off after 30 seconds of inactivity. After 180 seconds (3 minutes) of non-use, the screen will turn off automatically to save energy.