All wireless keyboards allow you to combine keys, however, with some models, more mistakes are made when several keys are pressed simultaneously. This phenomenon is called ghosting, and occurs when individual switches or sensors are missing for each key. To avoid this inconvenience, there are keyboards with anti-ghosting systems. The problem of ghosting in wireless keyboards affects the gaming world above all. Thanks to the key rollover that some models are equipped with, a keyboard will be able to recognize multiple keys pressed at the same time. The maximum number of keys could be preset, such as 6 or 10 keys at a time, or unlimited (NKRO). More frequent users prefer the NKRO models.