Buttons on left side of sight (not in back) to work specifically with NV or magnifiers; CR123 Lithium batteries; model with 65 MOA ring/1 MOA dot reticle; Compatible with Gen I-III+ Night Vision Systems (tandem operation); Raised 7mm base with knurled cross bolt; Interfaces to 1" Picatinny (MIL-STD-1913) rail.
This review is from: EOTech HOLOgraphic 556.A65/1 Weapon Sight (Sports)
Don't waste your time because the unit you receive will not be a EOTECH 556. The box has a sticker indicating it is a 556 (although it is not a 556 box - the side of the box is marked 551) but the unit is a discontinued 551 which uses a N cell battery (not the CR123 of the 556). The reticle also had some fade out spots on the edges so they must have been production rejects. I got one really cheap so I was tempted to keep it (which I am sure is what they intend - you know it is wrong but you may take it anyways due to it being cheap) but the defects relative to the reticle made me send it back plus - I've read that the battery life with the N cell stinks.
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