EOTech 553A65 CR123 Lithium Battery Black or Tan [EO553A65] - $639.95 : Bowers Tactical, featuring products from Accuracy International, ARMS, Bianchi, Blackhawk, Buffer Technologies, Bulldog, CQB Solutions, Don Hume, First Samco, Fobus, GG&G, Gemtech, Global Tacital Supply, Hakko, Insight Technologies, LMT, Magpul Industries, Meprolight, Peltor, Starlight, Steiner, Streamlight, Tango Down LLC, Uncle Mike's, and Wiley X

Optics: Transmission holography - 100% parallax free
Magnification: 1x
Eye Relief: Unlimited
Length/Width/Height: 4.9"x1.8"x2.8" (124x49x71 mm)
Weight: 12.3 oz (349 grams)
Temperature: -40 to 150 F
Waterproof: Submersible to 66 ft depth
Sealing: Fogproof internal optics
Color/Finish: Flat Dark Earth (non-reflective black on some small components) or Non reflective black with hard coat finish
Adjustment (per click): 0.5 MOA (1/2" at 100 yds)
Adjustment Range: +/- 40 MOA travel
Mount: USSOCOM requirements dictated dual quick release throw levers designed specifically for the Picatinny (MIL-STD-1913) mounting rail:
Certain commercial variants of the MIL-STD-1913 rail specification may not be compatible with the SU-231/PEQ (M553) mounting assembly.
The SU-231/PEQ (M553) base consists of (2) ARMS^® throw levers and is only adaptable to rails that properly accept the ARMS^® design.
Return to Zero: Repeatable to 1 MOA after re-mounting

Brightness Adjustment Range: 110,000:1 brightest to lowest
Night Vision Brightness Range: 1000:1 with NV switch engaged
Power Source: 2 x 123 lithium batteries
Battery Life: 1100 continuous hours at nominal setting 12
Brightness Settings: 30 settings with scrolling feature (10 settings for NV use)
Auto Battery Check Indicator: Flashing reticle upon start-up
Auto Shut-down: At 8 hrs- programmable to 4 hrs