SUNMAS® medical devices are FDA cleared Class II, OTC for safety and effectiveness, no prescription needed. 

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The FDA approves drugs and generally Clears medical devices as premarket approval (PMA). Both the approval and the clearance documents submitted undergo intense scrutiny and multiple reviews.
The purpose of a 510(k) submission to the FDA is to demonstrate that a device is “substantially equivalent” to a predicate device (one that has been cleared by the FDA or marketed before 1976). The submission compares and contrasts the subject and predicate devices, explaining why any differences between them should be acceptable.
While human data is not required for all 510(k), in many cases efficacy data from well-controlled clinical studies proving efficacy and safety are required especially for new indications. This is especially true for a new indication such as “promotion of body health” with TENS and powered muscle stimulators.. The SUNMAS TENS and powered muscle stimulators. was subject to this more stringent requirement in that the results of large clinical studies complying with all Good Clinical Practices and Safety & Performance Tests had to be submitted with each 510(k) submission for rigorous review.