The Amrex MS 322 Low Volt AC Muscle Stimulator Unit is a brand new, sealed device designed for use in various medical and lab settings. This unit, specifically the Amrex MS 322 model, is perfect for muscle stimulation therapy and is ideal for professionals in the healthcare industry. With its compact size and easy-to-use functions, this muscle stimulator unit offers a convenient and effective solution for those in need of targeted muscle stimulation.