SNDWAY MT4 Battery Model Infrared Rangefinder High Precision Electronic Ruler Laser Rangefinder 1. Aspheric optical focusing lens, low distortion and anti-interference performance, significantly reduce the influence of ambient light 2. Dual light-sensitive apertures, no horizontal bubble, no plus or minus measurement function storage function 3. Phase modulation, high frequency light signal emission 4. Phase optics, laser emission and reception enhancement 5. Singlecontinuousareavolumehookup 6. Measuring range: 40m 7. Measuring accuracy: 2mm 8. Automatic laser cut-off: 20 seconds 9. Automatic shut-off: 150 seconds 10. Operating temperature range: 0-40 degrees Celsius 11. Storage temperature range: -20 to 60 degrees Celsius 12. Power supply method: 2 x 1.5V batteries (product not included) 13. Packing list: main unit, manual, colour box 14. Material: ABS 15. Gross weight: 140g