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.Waterproof Construction - O-ring sealed optics stay dry inside, even when totally immersed in water.Shockproof construction - Built to withstand bumps, bangs, drops and the rough-and-tumble environment of the field.Nitrogen Purged Fog-Proofing - Nitrogen inside the scope ensures interior optical surfaces won't fog due to humidity or rapid temperature change. California Proposition 65 WARNING:This product can expose you to chemicals including lead, that are known to the State of California to cause cancer, and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov