The Mad Catz R.A.T. PRO X3 sits at the top of the wired R.A.T. range, aimed at competitive players who want tournament-grade responsiveness alongside the series' trademark physical customisation. It uses a PixArt PMW3389 optical sensor with up to 16,000 DPI, 400 IPS tracking and 50G acceleration, but its standout figure is a 3000Hz polling rate delivering a 0.3ms response time, faster than the standard 8+ and ADV models. It carries 10 programmable buttons on Omron switches rated for 50 million clicks, plus a customisable optical scroll wheel that also supports analog axis input for games that use it. True to the R.A.T. name, the PRO X3 ships with 3 interchangeable palm rests and 2 pinkie rest options to fit different hand sizes, dual thumb rest configurations, and even a choice of ceramic or Teflon glide feet and interchangeable scroll wheel materials. At 105g and 115 x 87 x 38mm it's noticeably lighter than the 8+ series, wired via a 1.8m braided-fibre cable, with 16.8-million-colour RGB, 10 on-board profiles and full macro/sensor customisation through Mad Catz's software on Windows 7, 8 or 10.