K3 -Non-Backlight Ultra-Slim Wireless Mechanical Keyboard (Version 2) 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 of spaces. Thanks to the innovative low-profile design, the switches are up to 40% flatter than conventional switches. Together with the streamlined aluminium case, this makes the K3 one of the thinnest and lightest wireless mechanical keyboards in the world. Revolutionary connectivity - Bluetooth 5.1 or wired 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. For improved workflow and multitasking, you can connect up to three Bluetooth devices simultaneously and switch from laptop to tablet or mobile. Aluminium frame + long-life battery This model features a sleek and stylish aluminium frame for increased durability and rigidity. The large 1550 mAh battery can even be used for around a month (with 8 hours of daily use), or up to 268 hours on a single charge.