The Royal Kludge RK98 Mechanical Wireless Keyboard User Manual provides comprehensive instructions on how to use this high-quality keyboard. With its mechanical design and wireless capabilities, this keyboard is a popular choice for users who want a reliable and efficient typing experience. The manual covers all the basic features of the product, including wired mode and charging, BT connection, backlight control, special function keys, and battery reminder. It also includes instructions for custom backlight set up and multimedia key usage for both Windows and Mac systems. The manual specifies the system requirements for BT mode, which includes devices with Bluetooth 5.1 or later, PCs with Windows 7 or later, Macs with macOS X 10.6 Snow Leopard or later, and iOS devices with all iPads/iPhone 5 or later, and Android devices with 5.0 Lollipop or later. If users have any issues or questions regarding the product, they can contact the seller for assistance. This user manual is an essential guide for anyone who wants to make the most of their Royal Kludge RK98 Mechanical Wireless Keyboard.