Look inside the installed A4Tech software folder for a utility named Pairing Program or PairingID.exe . Launch this tool and follow the on-screen instructions (usually involving holding down specific keys while inserting the USB receiver) to re-sync the hardware signal. Conclusion
: For bundles featuring the GK-85, you may need software such as "16-in-One" for mouse gestures or "Office Shuttle" for key commands. Device Compatibility & Requirements a4tech gk-85 driver download