The M65 RGB Elite uses Omron switches with a rated lifespan of 50 million clicks for the left and right buttons.
RGB effects can be customized and synced with other Corsair peripherals such as the K70 MK.2 Rapidfire keyboard. There are two RGB zones (one in the scroll wheel and another in the Corsair logo) and an RGB DPI indicator. Polling rate can be selected from 125 Hz all the way up to 1,000 Hz in the iCUE software. Various RGB and DPI settings can be stored onboard in one defined hardware profile. The PMW3391 has a maximum resolution of 18,000 DPI, which can be configured in increments of 1 DPI for precise control. For starters, you get the high-end PMW3391 optical sensor, which is Corsair's variant of the PixArt PMW3389. The Corsair M65 RGB Elite sports a good feature set for the price.