If you are looking for a small, light and fast red dot and laser scope that can be used even at night, then the Eotech XPS3-0 is what you want. The single transverse 123 battery of this Eotech holographic sight cuts down sight length. As this Eotech night vision scope runs on a single battery, it offers more rail space, so you have enough room for rear iron sights or NV mount. The simple O-Ring and tethered cap of this Eotech night vision scope helps to provide excellent sealing. This Eotech holographic sight is waterproof and can be submerged in water of up to 33 feet. Thirty brightness settings in the Eotech XPS3-0 allow you to adjust the brightness level according to your requirement.