Measurement Accuracy:+/-2mm Size:10x4.3x2.5cm Model Number:KE40,KE50,KE60,KE80,KE120 Power Type:Battery-Powered Origin:Mainland China Certification:CE,FCC,RoHS Our laser distance meter are handheld and easy to operate. The distance is measured accurately. With the function of measuring area, volume, addition, subtraction. Perfect for an interior makeover or a great gift. Pictures for KE40/50/70/100/120 Button Description 1.Display 2.Turn on/Measuring 3.Addition 4.Reference Point/Unit Switch 5.Area/Volume/Pythagorean Mode 6.Bubble level 7.Subtration/Sound 8.Save 9.Turn off/Remove