2-in-1 Laser Tape Measure: 5 m tape plus a 40 m laser rangefinder, with accuracy +/- 2 mm. Continuous measurement is obtained by moving the device within its effective range. The dual photosensitive apertures help improve measurement stability. Rich functions you can rely on: switch between meters, feet and inches to fit your habit; 40 m laser range for long-distance measurement. Includes single and continuous measurement, area, volume, and Pythagorean measurement. USB rechargeable design: 180 mAh rechargeable lithium battery for longer life, up to 5 hours of continuous use at maximum power. USB rechargeable and reusable, reducing battery waste. Self-locking mechanism: automatically locks the current measurement position after extending the tape. Press the unlock button to retract the tape safely, preventing hand injuries. Use scenarios - Interior layout and furniture installation: measure wall lengths, determine room area and volume, plan arrangements accurately. - Long-distance layout: measure across large rooms, hallways, or outdoor spaces with the 40 m laser range for quick, precise results. - On-site carpentry and construction: perform single and continuous measurements, area/volume calculations, and Pythagorean checks for accurate cut sizes.