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 60-key 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 macro-creation for three definable layers. It's equipped with hot-swappable switches for fast and easy hardware customization, as well rubber anti-sliding feet for increased stability. Specifications: 60-key PCB is compatible with most general-purpose 60% enclosures RGB lighting: 256 x 256 x 256 LED driver chip supports 16.8 million colors 32-bit MCU Built-in 8M Flash Type-C USB connection Features: Rhythm and sound lighting control, key programming and macros, three definable layers Hot-swappable switches Rubber anti-sliding feet Gateron optical switches Axis Body Type: Blue/Red/Black/Brown (Optional) PBT DYE Sublimation keycap Pls 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 USB-C cable is detachable for convenience of portability.)