1: Pythagoras function for remote measuring of height or length 2: Addition / Subtraction calculation and areaolume measurement 3: Backlit display shows multiple readings. 4: Audible alarm Name:Distance Meter with a measuring range of 0.05-40m Laser auto off:60s Power auto off:60s Measuring distance:0.05-40m Accuracy:1.5mm/0.06in Measurement units: m/in/ft Laser Type:Red laser, 635nm, Less than 1mW, Class II Operating temperature:0-40,(32-104) Battery:Powered by 200ah 3.7v Dimensions:100mm x 12.5mm x 32mm Weight:100g Electronic level:With level Colour:Silver Material:Aluminum ABS Package Contents: 1 x USB charging cable 1 x Lanyard 1 x Rangefinder 1 x English instruction manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.