RecruitingDevice studyA Pivotal Study to Evaluate the Effectiveness of Isometric Handgrip Therapy in Elevated Blood Pressure and Hypertensive SubjectsThe study will be a multi-center, randomized clinical trial to evaluate the safety and efficacy of using the Zona Plus handgrip therapy device compared to the use of an auditory relaxation therapy for treatment of high blood pressure and hypertension in subjects who are not currently taking antihypertensive medications. Half of the study subjects will also be randomized to record blood pressure at home throughout the study.