The Keychron K3 is the universal wireless mechanical keyboard with an ultra-slim case and a compact 75% layout for maximum efficiency in the smallest space. Thanks to the innovative and low-profile design, the low-profile switches are up to 40% flatter than conventional switches. Keyboards. Together with the streamlined aluminium case, this makes the K3 one of the flattest and lightest wireless mechanical keyboards in the world. Whether for PC or Mac OS, the Keychron keyboards are compatible and meet all requirements. The desired operating system is set via a switch on the keyboard frame. Each Keychron keyboard comes with the additional keycaps for Mac and Windows, as well as a keycap puller. For improved workflow and multitasking, you can connect up to three Bluetooth devices simultaneously and switch from laptop to tablet or mobile. This Keychron keyboard has a fully hot-swappable PCB, which means that the switches are not soldered in. This makes it easy to upgrade, swap and mix the low profile Keychron Optical Switches, simply plugging and unplugging them at will. The keyboard is equipped with excellent RGB LED backlighting for an optimal and customised typing experience. With 15 different lighting modes, flashing, breathing or static, the desired atmosphere can be created. This model features a sleek and stylish aluminium frame for increased durability and rigidity. The large 1550 mAh battery lasts up to 72 hours with the backlight on.