Mechanical Switches - Ideal for a smooth and quieter typing experience, Gateron Red mechanical switches are the go-to for versatility. 9 Backlight Modes - With 9 backlight modes to choose from, you can pick from a variety of different light settings for the perfect visual experience. Mac & PC Compatible - Built to fully support both Mac & PC interfaces. The IZO comes with hybrid Operating System keycaps which display both OS icons. Bluetooth & USB Interface - By toggling the switch on the back, users can select between wired USB or Bluetooth mode when used as a number pad. Easily connect up to 3 devices in Bluetooth mode. Stand-alone Calculator - The IZO number pad functions as a standalone calculator when not used as a number pad, giving you two-in-one. Calculator function keys were built specifically for all calculator necessities.