The Safety and Effectiveness of Q Therapeutic System, Frequency-tuned Electromagnetic Field Treatment in Facilitating the Recovery of Patients With Chronic Stroke.

Inclusion Criteria: * Be between ages 18-80 * Have an score between 22-50 (inclusive) of impaired limb on the Fugl-Meyer Assessment for the Upper Extremity (FMA-UE), as determined by study staff * Have upper extremity function that is not changing much over time (as determined by study staff based on assessments I complete at screening and before treatment starts) * Have stroke due to ischemia or to intracerebral hemorrhage • Be \>6 months to 5 years from stroke onset * Have a Box \& Block Test score with affected arm is ≥1 block in 60 seconds at Baseline Visit * Be able to sit with the investigational System for 40 consecutive minutes * Be able to follow a 3-step command in English, such as "take the paper, fold it in half, and return it to me", or a non-verbal equivalent * Have the willingness to participate in physical exercises during study intervention sessions. * Be sure of the availability of a relative, friend, or other non-hired caregiver to be able to assist during program sessions and study visits, as needed Exclusion Criteria: * Be younger than 18 years old or older than 80 * Have implanted MR-incompatible devices or MR-incompatible retained objects (like shrapnel) or an implanted life-sustaining MR-compatible devices (such as a pacemaker or internal cardiac defibrillator) * Have conditions other than stroke, such as: A. Severe neglect impairment interfering with assessments or treatments. B. Severe depression, defined as GDS Score \>10/15 C. Active epilepsy o…