In theory, wireless will have a delay, in fact, some high-end keys and mice have achieved no delay, of course, the price is more expensive! For ordinary games, there is no problem with wireless, but FPS type of games requiring fast response are still recommended to use wired keys and mice! Generally, the current keyboard is 5 to build no impact design, part of the PS2 interface can achieve no impact, this can go to check! I am now using two mice at the same time, surfing the Internet, lying down to watch movies using the normal, gaming MX518