Given the fact that all of the models on this list are enabled with Wi-Fi connectivity, this could lead to this question. Here is the thing, though, this is not indicative of the entire picture. Even though a security camera can have the most advanced wireless connectivity in the world, it still may not be completely wireless. The issue comes with how it draws its power. Some models you are looking into may need to be plugged into your home AC receptacle.
However, there will also be other models that use the power of batteries to draw their power. In this case, the camera can be 100 percent wireless. Then again, they could be wired into a DVR or VCR. Truth be told, even if you have to deal with some wires, the hassle should be kept to a minimum as all you need to perform is a bit of cable management.