IDTech Windows SDK Guide  1.1.178.0 / NuGet 2.0.1.13
API reference for SREDKey2
Connecting to SREDKey2

The SREDKey2 connects through USB. The Audio Jack interface is not supported at this time

Connect with USB:

The SREDKey2 uses USB-HID (Human Interface Device) and does not need any vendor-specific drivers. Simply by plugging into an available USB port makes it available for SDK connectivity.