EOTech 552. XR308 Holographic Weapon Sight

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Specifications 
 Operation
OpticsTransmission holography - parallax free
Magnification 1x
Eye ReliefUnlimited
Length 5.4"x 2"x2.25" (137x50.8x57 mm)
Weight 10.9oz (309 grams)
Temperature -40 to 150 F (using AA lithiums); -20 to 140 F (all other battery choices)
Waterproof Submersible to 33 ft depth
SealingFogproof internal optics
Adjustment(Per Click) 0.5 MOA (1/2" at 100 yds)
Adjustment Range +/- 40 MOA travel
Mount1" Picatinny (MIL-STD-1913) or Weaver rail
Return to Zero Repeatable to 1 MOA after re-mounting
 Heads-Up-Display Window
Optical Surfaces Anti-glare coating
Window Dimensions1.20" x 0.85" (30 x 23mm)
Front Window Material1/8" solid glass
Rear Window MaterialShatter resistant laminate (3/16" thick)
Field of View (100 Yds) 30 yds (28m) at a 4" eye relief
 Elecrical
Brightness of Adjustment Range 146,000:1 brightest to lowest
Night Vision Brightness Range1280:1 with NV switch engaged
Power Source 2x 1.5V AA batteries (supports lithium, alkaline, or rechargeable)
Battery Life1,000 continuous hours (lithium) at nominal setting 12; 600 continuous with AA alkaline
Brightness Settings30 settings with scrolling feature (10 settings for NV use)
Auto Battery Check Indicator Flashing reticle upon start-up
Auto Shut-downAt 8 hrs- programmable to 4 hrs