After a lot of searches at the web I found 2 "versions" of the Ouroboros (that's how it looks to me). The first one is with one laser sensor while the other one have a dual laser sensor. At the close local electronic store I was able to found only the version with the one laser sensor. Another thing is that at the razerzone US that shows the version with the one laser sensor while at the razerzone Russia it shows the version of the dual laser sensor. Last thing is that someone told me that razer builds new version every year or something like that so if someone know's how can I know what is the product year of manufacture without opening the product and what is the newer version I'd be happy. Version 1 with only 1 laser sensor Version 2 with dual laser sensor Sorry for my bad English.... The main question is which version is better/newer?