The EOTech HWS EXPS3 Holographic Weapon Sight is an excellent choice for professionals. The EXPS3 offers true two eyes open shooting for fast target acquisition, night vision compatible settings, and a 7mm raised quick detach base for lower 1/3 iron sight co-witness. Mounts to a 1" Weaver or MIL-STD-1913 rail. It has 20 daylight brightness settings 10 additional settings for Gen I through III+ night vision devices. Runs on 1 x CR123 battery that will run for 1,000 continuous hours at nominal setting 12 at room temperature. Comes with a protective case.