This unit contains a Class II Laser with 1mW output Leica's newest laser distance measuring tool, the Leica DISTO D1. Accuracy that will leave your tape measure on your belt, and functionality that will keep your pencil at home. Functions: Distance, Tracking Interface Bluetooth smart Scope Instrument with 2 x AAA batteries Range 0.2 – 40m Accuracy +/- 2mm Distance Meter, Measuring Range - Maximum 40 m, Measuring Range - Minimum 1/4 m, Accuracy 2 mm, Battery Size AAA, Connectivity Bluetooth, Display Type LCD, Includes Warranty Card, Includes Batteries Batteries Included, Beam Color Red, Measuring Units Feet, Inches, Meters, Number of Values Stored 0, System of Measurement Metric/SAE, Color Red, Features 2-Line Memory, Bluetooth, Tracking, Functions Area Measurement, Class Class 2, Wavelength 636 nm