I needed this iClicker for a college class and it works just like its suppose to. I've used it for a couple different classes now too and I haven't had any problems with it at all. After a year I've only had to change the batteries once since the batteries it comes with are a cheap off-brand set,  of course. There's a newer version of the iClicker that has a little screen on it but they both do the same exact thing, so if you're trying to save some money you'll be fine with just going with this one. Its only a few dollars cheaper than the same version found on the iClicker website but I also got free shipping so I figured to just get it from Amazon. Don't worry about it being fake or a knockoff, its a genuine iClicker product, and you just have to register it on the website to begin using it.