The EXPS2 is a premiere optic from Eotech. The Holographic Sight has been an industry standard for years. The EXPS2 uses a CR123 Lithium battery.
Red 68 MOA Ring with 1 MOA Dot.
Quick-detach lever fits both 1" Weaver and MIL-STD-1913 rail.
Battery life of 600 continuous hours at nominal setting 12 at room temp