We have seen joysticks. We have seen controllers. We have seen hit boxes and keyboards. We have even seen players use piano controllers as their input method of choice in tournaments. But this is a another interesting mix-up of various controller options.
Aptly named the Mixbox, the device combines a keyboard directional pad for directional inputs with the Vewlix layout expected of modern joysticks for button inputs. Jonyfraze recently reviewed this — and calls it a solid option for keyboard players!
Source: Jon Bonilla