Accuracy: 2mm Range 0.1-50m Laser parameters: 635nm Protection class: IP54 Area / volume / indirect measurement (Pythagorean double Pythagorean Law and Law of measurement) Metric conversion Measurement starting point conversion Display backlight. Back 1 / 4 threaded interface with tripod connection. Keyboard - new waterproof and dustproof keyboard more comfortable in use. Extension rod - used to start measuring from the corner or space. Auto power off function; for 5 minutes without using equipment, apparatus, automatic shutdown, effectively extending battery life. The number of each cell measuring 10,000 times Operating temperature range: -10 - 50 degrees Battery: 4AAAx1.5V Size: 112X53X33MM Weight: 200g