?Fantastic Typing Experience: With the built-in anti-ghosting technology, SK61 will allow you to execute command sets perfectly, without any intermittent or lagged response problem. ?Durability: upgraded PBT Sub-dye keycaps, not easy to fade, durable to use. Built-in waterproof PCB for Maximum stability. ?Programmable RGB Backlit : 9 kinds of RGB backlight modes, 16 million colors of light and key combination modes can be customized by you. ?Hot Swappable :GK61 60% percent mechanical keyboard supports hotswapped, you can change the Switch of different colors (with Optical switches only). ?Gateron Optical Red Switches : Presses smoothly down without any bump or click. Means a much quieter typing sound that is perfect for the office workspace.