3X optical magnification; Compatible with Aimpoint red dot sights for longer range aiming or observation; Variable (-2 to + 2) dioptric setting; Equipped with FlipMount and TwistMount base for easy picatinny rail attachment and removal; Also serves as a handheld 3X monocular; No re-zeroing needed when shifting between non-magnified and magnified aiming; Ergonomic design for sure grip when used as a handheld observation tool; Shockproof and Waterproof; Legendary Aimpoint ruggedness at an entry level price point; Screws and allen key included