?Oil-Resistant PBT Keycap?: Surmen keyboard comes with 3 Dye-Sub keycaps (ESC+space bar+enter). Keycaps with OEM profile provide uniform backlight and ergonomic curves, ensures lettering that doesn't scratch off. ?Full Keys Anti-ghosting ?: Advanced anti-ghosting technology allows all 61 keys to work simultaneously to provide a fast typing response, and supports plug & play. ?Up to 3 Devices Connected? Bluetooth wireless mechanical keyboard up to 3 matching devices recorded, ideal for PC/Laptop/Pad/Smart Phone. Press FN+E/R/T to switch in easy. ?Gateron yellow switch ?: Light and Linear. very smooth, quiet, vertical pressing sensation with no clicky feel. Good for quick and long-time typing in the office, and gaming if you like. ?Hot-swappable?: Hot-swap PCB allows you to replace 3 pins switches freely, compatible with any MX-style switch (brands like Cherry, Gateron and Kailh, etc.).