The Tamron TAMRON-LINK connects to the USB-C port on compatible lenses and pairs with the Tamron Lens Utility app for wireless control of your lens from your smartphone up to 16’ away. Control features include: digital follow focus, ring stopper, astro focus lock, and focus time lapse. You can also remotely adjust the focus ring direction and button assignment. Your Tamron lens must be equipped with a USB-C port for this to work. See if your lens is compatible with Tamron’s Supported Features by Lens checker.