Correctamundo. Only Unitron, and Unitron also has Trial hearing that will provide annoying beeps when the trial-period expires (after six weeks or so). But then you can reset to a new/fresh Trial period for another six weeks using the Unitron hearing aid fitting software.
We don't know of any other possible free access to better functionality or free trials, and if I recall correctly the Unitron freebees are only for certain legacy models and not current technology.
