Ultra-Slim - The innovative low profile switches are up to 40% slimmer than conventional switches while still offering the exceptional response of mechanical keyboards. Together with the streamlined aluminum body, it makes the K3 one of the thinnest and lightest wireless mechanical keyboards in the world Features durable Gateron low profile mechanical switches available in Blue (clicky), Brown (tactile) and Red (smooth linear) to meet your typing preference Compatible with Mac OS, Windows, Linux and Android and includes swappable keys to match the key callouts for your desired operating system RGB Backlighting - allows for colourful and crisp visibility and includes 18 backlighting effects. Connect up to 3 Bluetooth devices with Bluetooth 5.1 and switch seemlessly between them, or connect in wired mode via USB-C connection 1550mAh rechargeable li-polymer battery provides up to 34 hours of wireless use