Variable (-2 to + 2) dioptric setting Compatible with Aimpoint red dot sights for longer range aiming or observation Ergonomic design for sure grip when used as a handheld observation tool; Shockproof Weight 7.8 oz / 220 g (magnifier only) Submersible to 2 feet (.5 meters) No re-zeroing needed when shifting between non-magnified and magnified aiming Commercial Grade INCLUDES: TwistMount base, 39mm FlipMount, HEX key