LITERITE  Auto-Adjust 3-Dot Red Dot Sight (UNIVERSAL MOUNT fits all crossbows with 7/8″weaver style base) This new sight features an electronic sensor with an “auto” setting that automatically adjusts the brightness of the 3 aiming dots depending on the amount of daylight. Six additional manual positions allow the selection of lower or higher brightness settings. The three aiming points are 3-MOA size and are calibrated in approximately 10-12 yard increments with arrow speeeds of 300 FPS. Waterproof and fog proof. 42mm tube, Weight: 6oz. Length: 5.5″; FOV @ 50 yards: 29 ft.