The Bushnell AR Optics TRS-26 Red Dot goes beyond its historic predecessor with improvements in several key areas. The TRS-26 is powered by a long-lasting battery that sets the industry standard with more than 50,000 hours of battery life. It delivers a brighter, crisper 3-MOA dot with push-button operation in a compact package. The Bushnell AR Optics TRS-26 is the standard for multipurpose red dots. FeaturesWaterproof Construction- O-ring sealed optics stay dry inside, even when totally immersed in waterShockproof construction- Built to withstand bumps, bangs, drops and the rough-and-tumble environment of the fieldNitrogen Purged Fogproofing- Nitrogen inside the scope ensures interior optical surfaces won't fog due to humidity or rapid temperature change