How do I tell if player has a non-xbox controller?

I've added controller remapping functionality, however I would like to pop up a message for a user with a controller that is NOT xbox compatible - to tell them to run the remap program.

Is there a standard the string: gamepad.GamepadID(0) uses? Can I just do a string search for 'xbox' (case insensitive) and if not found, feel confident it is not an xbox controller?

Platform will be Chrome since I plan on using NWjs