EOTECH Holographic System Holographic Sight #552 XR308

The most widespread version in the tactical/operative community: used by the U.S. Army, DEA, ATF, and FBI SWAT.

Technical Sheet:

Dimensions: 143 x 51 x 64 mm
Waterproof: Up to 10 meters depth
Mounting: MIL-STD-1913 rail, 1" Weaver
Power supply: Two 1.5 V AA batteries (lithium, alkaline, or rechargeable)
Battery life: lithium - 1,000 continuous hours (setting 12 at room temperature); alkaline - 600 continuous hours (always setting 12)