Pls pay attention: To avoid damaging PCB hot swapping sockets, pls make sure your switches' pin is vertical , and you'd better not using used key switches with soldering tin.The SK61 Optical Switch Mechanical Keyboard Kit is ideal for anyone looking to build a 60key keyboard that won't quit. The new Gateron optical switches in this kit are rated for an impressive 100 million keystrokesdouble the industry standard. They use infrared beams to detect each keystroke, a precise method that leads to an extremely fast response time of roughly 0.2 millisecondsgreat for gaming and other tasks where speed is essential. This kit also features RGB lighting with 16.8 million LED color combinations, rhythm and sound lighting control, and key programming and macrocreation for three definable layers. It's equipped with hotswappable switches for fast and easy hardware customization, as well rubber antisliding feet for increased stability.Specifications:60key PCB is compatible with most generalpurpose 60% enclosuresRGB lighting: 256 x 256 x 256 LED driver chip supports 16.8 million colors32bit MCUBuiltin 8M FlashTypeC USB connectionFeatures: Rhythm and sound lighting control, key programming and macros, three definable layersHotswappable switchesRubber antisliding feetGateron optical switchesAxis Body Type: Blue/Red/Black/Brown (Optional)PBT DYE Sublimation keycapPls pay attention: this keyboard can only support Optical Switch(cant be changed to MX switch)Package includes:1 Set X Wired RGB Mechanical Keyboard (The USBC cable is detachable for convenience of portability.)