NOTE: Class II - Rx Required The InTENSity Twin Stim IV is the newest standard in portable multifunction electrotherapy offering patients two modalities in one user-friendly ergonomic design - Transcutaneous Electrical Nerve Stimulation (TENS) and Neuromuscular Electrical Stimulation (NMES). Equipped with pre-set body part specific settings as well as a customizable option the InTENSity Twin Stim IV intuitively guides the patient step-by-step to ensure the ideal therapeutic treatment throughout the healing cycle. In addition patients can modify treatment time pulse rate and duration (width) cycling time and contraction/relaxation/ramp times. The NMES setting sends gentle electrical pulses in a contraction and relaxation rhythm to help relieve muscle spasms re-educate muscles and help prevent muscle atrophy. The wide-ranging capability of the InTENSity Twin Stim IV is perfect for those patients with multiple electrotherapy needs. With the powerful rechargeable lithium ion battery this portable device can be used at home at work or on the go.