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