1: Pythagoras function for remote measuring of height or length 2: Addition / subtraction calculation and area/volume 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: 0-40C (32-104F) Battery: Powered by 2000mAh 3.7V rechargeable battery Dimensions: 100mm x 12.5mm x 32mm Weight: 100g Electronic level: With level Color: 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 is included; other products are not included Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3cm