Ensure the second switch is set to (Bluetooth) rather than "G" (2.4Ghz wireless). 2. Enter Pairing Mode The RK908 can save up to three devices. Press and hold FN + Q , FN + W , or FN + E for 3–5 seconds.
Are you trying to pair it with a (Windows, macOS, or iPadOS)? rk908 bluetooth keyboard manual link
Ensure you are using the provided USB-C cable. Some high-wattage laptop chargers (PD chargers) may not trigger the charging circuit on mechanical keyboards. Plug it into a standard USB port on your computer. Keys Not Registering Ensure the second switch is set to (Bluetooth)