EOTech EOTech designs , manufactures , and markets electro - optic products and systems . The company is headquartered in Ann Arbor , Michigan . They produce holographic weapon sight s for small arms that have been adopted by various military and law enforcement agencies as close quarters battle firearm sights . They also have roots in the Environmental Research Institute of Michigan ( ERIM ) , a non - profit R & D institute . Of the many inventions by ERIM researchers , some were in the fields of synthetic aperture radar , laser holography , and aircraft head - up display s . Products . As of 2012 , EOTech primarily manufactures holographic weapon sight s . EOTech was the first company to create these types of sights , having solved the problem of wavelength instability exhibited by laser diodes . They developed achromatic holographic optics that compensate for any change in the emission wavelength of the laser diode with temperature . The sights are designed to be mounted on small arms via a MIL - STD - 1913 Picatinny or Weaver rail , and powered by either AA , N or CR123 size batteries for up to 1 , 100 hours of runtime . Sights display either a 65 MoA ring with a 1 MoA dot in the center , a single 1 MoA dot , a vertical series of dots for bullet drop compensation in certain calibers , or , in the case of their less - lethal sights , a flared vase - like sight to assist in the aiming of bean - bag or rubber ball rounds commonly used in riot control . Bushnell marketed the non - military versions under the brand name " Holosight " . The EOTech 553 is in U . S . military service under the designation SU - 231 / PEQ and M553 in the commercial market . A specialty sight for the grenade launcher has also been accepted by the U . S . military and is given the designation SU - 253 / PEQ . An archery sight was discontinued in November 2004 , in line with the company ' s desire to concentrate on military and law - enforcement products . Technology . Unlike reflector sight s , the holographic weapon sight does not use a reflected reticle system . Instead a representative reticle is recorded in three - dimensional space onto holographic film that is part of the optical viewing window . Like the reflector sight , the holographic sight ' s reticle uses collimated light and therefore has an aim - point that can move with eye position . This is compensated for by having a holographic image that is set at a finite distance , in this case around 100 yards . The sight ' s parallax due to eye movement is the size of the optical window at close range and diminishes to zero at the set distance . Since a laser is used as the light source , the aiming reticle can be an infinitely small dot whose perceived size is given by the acuity of the eye . For someone with 20 / 20 vision , it is about 1 MoA . To compensate for any change in the laser wavelength , the EOTech sight employs a holography grating that disperses the laser light by an equal amount but in the opposite direction as the hologram forming the aiming reticle . The result is a reticle that is stable with the change in temperature . One requirement of holographic projection is a laser . Lasers use more power and more complex driving electronics than an LED of an equivalent brightness , reducing the amount of time a holographic sight can run on a single set of batteries .