Gateron Optical Switch & Hot Swappable.Hot-swap switches allows you to change switches without soldering(Hot Swappable with Optical switches only) If you find that some keys are unavailable, and one of the W/E/R keys lights up at the same time, you may enter to the custom mode.Please press FN+Q to return to standard mode Approximately 16.8 million color RGB effects, with the driver can be configured with massive lighting effects Strong compatibility & Type-C dual modes. Works on PC, PS4.It will be the best valentine's day gifts for him Record macros through the software, customize advanced features , personnalize function keys.Full Anti Ghosting Mode (NKRO)