The Laser Battery Cap 2 (LBC2) is a drop-in replacement that fits the 512/552/518/558 EOTech Holographic Weapon Sights. Simply remove your existing battery cap and replace it with the new LBC2 and the lightning fast target acquisition you have come to expect from your HWS is expanded to include the versatility of integrated aiming lasers with a red visible and a civilian legal IR option. This combination will prove ideal for home defense or force-on-force training. The LBC2 also features an integrated accessory port that allows for the use of a CFL-053-4 remote pressure switch, available for purchase separately. Length/Width/Height: 2.75" x 3.27" x 0.96" (69.9 x 83.1 x 24.4 mm) Weight: 5oz (140 g) Water Resistant: Submersible to 33 ft. (10 m) depth Mount: All 512/552/518 and 558 EOTech HWS Power Source: Two 1.5 V AA batteries Lithium batteries are recommended, run-time results with alkaline vary Battery Life: Lithium: 36 continuous hours at nominal setting 12 with both lasers on at room temp. Alkaline: 24 continuous hours at nominal setting 12 with both lasers on at room temp. Visible Aiming Laser: Output Power: < 5mW Wavelength: 635 nm (Nominal) Class IIIR Fully adjustable windage and elevation IR Aiming Laser: Output Power: < 0.7 mW Wavelength: 830 nm (Nominal) Class I Fully adjustable windage and elevation