R-C101F is a dual channel output TENS (transcutaneous electrical nerve stimulation) and EMS (Electrical Muscle Stimulation) device. TENS Mode TENS mode is one of the normal exercises. It is used for temporary relief of pain in neck, shoulder, back, joint, hip, hand, abdomen, foot, upper extremities(arm) and lower extremities(leg) caused by or daily housework. It is also used for symptom relief and relief of chronic, persistent pain and pain associated with arthritis. EMS Mode 1. Relieving (relaxing) muscle spasms 2. To prevent or delay atrophy due to inactivity 3. Accelerating blood circulation in the area 4. Muscle reeducation(restoring the old vitality of the muscles) 5. Rapid stimulation of the calf muscles after surgery to prevent venous thrombosis 6. is used to increase or maintain range of motion. The device can be used in the hospital or at home. The device should be used by persons aged 18 and above. Please carefully read all instructions in the user's manual before use and keep the manual for future use.