Multi-device Connection It can connect up to 3 devices via bluetooth at the same time and switch between them by knob easily, then you can type on all your devices on the desk faster. Provides a variety of connection methods, including detachable USB-C wired mode, 2.4G wireless mode and Bluetooth 5.1. RK Linear SkyCyan Switch This hot swappable mechanical keyboard has the same force at both the beginning and end of each stroke, as quiet as red switch, but more tight feeling, that you can enjoy more accurate,cleaner, smoother touch. Clean sound brings you more comfort like the sprinkle,. The ideal one to fit home, shared workspace and light gaming. 3750mAh High-capacity Battery RK H81 keyboard is powered by a 3750mAh high-capacity battery.You can easily go through 7 days of daily use to satisfy your productivity and entertainment needs. Double-layer Inclined bottom frame makes it fit to type on even without a wrist rest. Hot-swap PCB allows you to replace 3 pins/5 pins switches freely without soldering issue. Enjoy the fun of making your own unique keyboard. RGB Backlit Choose from charming rainbow RGB effects and personalize the illumination with windows software to match any style. Supports 18 RGB Backlight Modes, 8 monochrome Backlight Modes, 1 full Color Backlight and 16 million colors on individually backlit keys.