The Keychron K5 is a 104 keys Ultra-slim white LED backlight Bluetooth mechanical keyboard made for Mac and Windows. Engineered to maximize your productivity with most popular full size layout with number pad. With a unique Mac layout while compatible with Windows, the K5 has all essential multimedia and function keys you need (Num Lock works with Windows only), and comes with a dedicated Screenshot Key, Siri (Cortana) Key, and Screen Lock Key. Extra keycaps for both Mac and Windows operating systems are included.