Vigilance Innovations Mini Tactical Rangefinder. Easy-to-mount system for rifles, bows, crossbows and more. Continuous distance measurement even in hazy weather. Check if the direction of the moving object is consistent. Display: illuminanted OLED Screen. Unit of Measure: yard/meter. Laser Class:Class 1 Weight: 220g (including battery). Water-resistant: IPx4 Speed Range:0-300Km/h. Battery: CR2x1(Not Included). Press key to start continuous measuring. Fog mode screen appears, press key to start measurement. Press key to start measuring. The horizontal distance and pitch angle will display, suitable for. Archery and bow hunting (arc mode). Press key to start in fog mode. You will be able to use horizontal distance measurement also. Target the object in same direction as the laser & press key to start the speed measurement. Speed mode, long press M button to switch”km/h” and”mile/h”.