Hot-swappable switch With the hot-swappable PCB, you can freely exchange 3-pole/5-pole switches without soldering problems. Enjoy the fun of creating your own unique keyboard. Triple-mode keyboards: Wireless mode with stable Bluetooth 5.1 chipset, hassle-free 2.4 GHz dongle and wired USB-C mode put no limits on your keyboard connectivity. The RK61 is best suited for smartphones, laptops and tablets. Portable Mini Size: 11.5 x 4 inch, mini compact size plus 0.5kg lightweight frame, portable to carry outdoors for work or entertainment, not just for indoor use. The RK61 is compact while providing convenient shortcut access to all major multimedia and function keys.