Another member here says they get a vibration in their Garmin Fenix when they get a Varia radar alert. Probably more noticeable than a audible alert from anything. I think that is
Seattle Forrest . Maybe he'll add if there are any constraints or if vibration is or isn't a feature in the many other Garmin watches of Forerunner, Fenix, Epix and all the other flavors of Garmin wearable including the vivo-whatever fitness devices.
Oh excuse me, I just looked back and saw that you don't want any other feature but a simple warning
tone!
So I guess a vibration is out. <grin>