SPECIFICATIONS Battery Type CR 2032 Brightness Levels 12 Levels Dot Size 2 MOA Battery Life 20000 Hours Body Material Aluminum Alloy Coating Multi-Coated Red Waterproof IP65 Weight 62g / 2.18 (oz） Dimensions 1.73*1.41*0.82inch（red dot only） Mount Type Picatinny or Weaver Elevation Adjustment Adjust the point of impact to up, and turn the screw counter clockwise. Windage Adjustment Adjust the point of impact to the right, and turn the screw clockwise Picatinny Rail Base Compatible with all 0.8"/21mm Weaver or Picatinny standard rail mout. Shockproof Design Aluminum alloy construction, durable and shockproof. Works great in all weather conditions. Two Mount Options Meet your different Install needs. It has a very strong and safe rail mounting system. Fully Multi-Coated Lens Helps to minimize the glare and reflections, and provides a wide field of clear images for quick target acquisition. NOTICE： 1) When you encounter that the sights can not turn on, please make sure the battery is installed correctly and not turned over in the battery compartment, or change the batteries. 2) When you encounter that the mounting is losing, you can adjust the amount to be tight by an Allen wrench according to the above guideline. 3) When you encounter that the Elev./Wind. can not be adjusted, please loosen the Locking Screw, then adjust the Elev./Wind. What you will Get? 1x Red Dot Sight 2x CR2032 Batteries 3x Allen Wrenches 1 X Picatinny Rail Mount Plate 1 X Low Profile Fixed Mount Plate 1x Cleaning Cloth 1 x User Manual 1 x Rubber Cover 1 X Torx Key 4 X Screw Features: - Easy to operate and multifunctional - Durable and Ultra-lightweight When rail mounting is too loose, the sight will slide back and forth, you need to 1. Take the sight off the rail. 2. Close up the quick detach mount. 3. Use the wrench (included) to twist the nut which controls the tightness of the quick detach mount. 4. Turn the nut clockwise to tighten the base.