Mechanical Red Switches: Offering the satisfying Linear & Quiet typing experience, fitting for office or gaming use. 8 spare switches got as a gift. 18 Backlit Modes: Press FN + INS-PgDn to enter Pro-gamer mode. RGB LED adjustable lighting with 6-themed backlights -18 lighting models. You can also adjust their brightness with FN+ and Besides, there is a 9-color single backlit mode for this keyboard. N-key Rollover, Ergonomic Durable Design: K556 is made of full metal material, with a matte-finish texture, solid enough to protect it from scratch. It allows multi-keys to work simultaneously with high speed. Self-design & Removable Keycaps: The Redragon K556 features a custom designed keycap that has been made shorter to reduce the time it takes for your actions to register. Wide Compatibility: Windows10, Windows 8, Windows 7, Mac OS X, Windows XP, Windows VISTA, etc.