The Bushnell Optics 3x magnifier pairs perfectly with the Bushnell TRS-25, but works with any red dot. The magnifier mounts behind your optic and it comes with an ambidextrous flip mount. Engage the 3x magnifier when you need it. flip it out of the way when you don't. It's made with the quality you've come to expect from Bushnell with fully multi-coated optics that provide optimal light transmission and are waterproof, fog proof and shockproof. Features: - compatible with any red dot scope - ambidextrous design - fast-focus eyepiece - fully multi-coated optics - waterproof, fog proof, shockproof. Includes: - flip mount. Specifications: - waterproof: yes - length: 4.6 inch - weight: 13.2 oz. - magnification: 3 - lens coating: fully multi-coated - fog proof: yes - shock proof: yes - objective lens diameter: 25 millimeter - eye relief: Unlimited.