?RGB Backlit Wireless Bluetooth keyboard?: Surmen 60% mechanical keyboard with RGB backlight. GT61 wireless gaming keyboard is also armed with a 1800mAh battery, lasting up to 24 hours (tested with static RGB lighting), or up to 5 days of normal use (8 hrs/day). ?PBT Keycaps & OEM profile?: Surmen keyboard comes with 3 extra keycaps (ESC+space bar+enter), the keycaps of gaming keyboard GT61 are not shine through and not easy to be oil and worn out. It can be at the matte state after long time gaming. ?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. ?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. ?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.).