Sharing info - not sure if it is going to help.
On the Home Page it states
Meet Cala kIQ™ — the only FDA-cleared, wearable device that delivers effective therapy for action hand tremor in people with essential tremor and Parkinson’s disease.
kIQ, pronounced “kick,” stands for Kinetic [movement] + IQ [smart]
However, when you click on Check Eligibility, it seems that it is not suited for PD patients.
Also - see this below, where it mentions that is approved for PD