This is an observation instrument that uses precision optics and digital technology to measure distances. It does not have any form of energy radiation and will not cause any damage to the human body during use. Specification: Name :Golf Rangefinder Magnification:7X Resolution:13 inch Eyepiece:0.63''/16mm Objective Lens:1.1''/28mm Visual Angle:7.8 degrees Distance:About 1000 yards Size:3.54x1.96x1.49'' Mode: 1. GENERAL MODE.(For the general situation. Put the target height into, you can measure the distance between the target and the object) 2. GREEN MODE.(For golfers, you can easily get the distance between the holes) Package Included: 1 x Rangefinder 2 x CR2032 Batteries 1 x User Manual 1 x Sling 1 x Storage Bag 1 x Wiping cloth.