K2 (Hot-swappable) version is a tactile wireless mechanical keyboard with Mac and Windows compatibility, and convenient access to all the essential function keys, with the largest battery seen in a mechanical keyboard. Hot-Swappable: This model of the Keychron K2 features a fully hotswap PCB which means that you can easily upgrade, replace and mix and match compatible switches by popping them out without the need to disassemble de-solder and re-solder in new switches. The K2 features a compact TKL layout for maximum efficiency in the smallest possible footprint Use in Wired or Wireless mode.