Features: Features long range measuring with extreme accuracy and measures distances up to 328 feet to within 3mm. Provides default real for time measurement that adjusts as you move closer and farther. Features display that allows measurements to be easily read,simple to operate. It support continuous measure,area measure,volume measure,pythagorean measurement.Widely use in house decoration, building construction, real estate and the infrared measure is for ideal for measuring areas or objects. Small, light, easy to keep in any pockets. Specifications: Model:OQ-40,OQ-60,OQ-80,OQ-100, Accuracy:±3mm Working Range:0.03m-40/60/80/100m Unit Options:m/in/ft Each Measurement Time:0.1s~4s Infrared Level:II Infrared Type:635nm,<1mW Continuous Measure:yes Area Measure:yes Volume Measure:yes Pythagorean Measurement:yes Add and Subtract Measurement:yes Min/Max Value:yes Max Storage:20units Buttons/keys Sound:yes Working Temperature:0°C~40°C Storage Temperature:-20°C~60°C Battery:2x1.5V AAA （not included） Automatically Cut Off Infrared:15s Automatic Shutdown:45s Product Dimension:Approx.118x54x27cm/4.65x2.13x1.06inches; Color:Red/Green/Yellow Package Includes: 1x Infrared Distance Meter (Without Battery） 1xPortable Bag 1xUser's Manual 1xGift Box 1xTie Rope note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.