The TENS and EMS Pain Relief Massager Unit, EHE029N is a proven effective and drug-free electric stimulation therapy for muscle soreness, stiffness, and tens unit for back pain, feet, shoulder, waist, joint, arms, and more. TENS electrodes send electrical pulses across the surface of skin to the nerve endings of the sore areas, providing fast and therapeutic pain relief.· As an EMS (Electrical Muscle Stimulation) device, EHE029N makes continuous and gentle stimulation to help with muscle toning and firmness, endurance improvement, and lower recovery time between workouts. EHE029N may also help local blood circulation in the healthy muscles of lower extremities for those who travel, sit for a long time, or need to enhance their blood circulation due to health conditions. Customizable: Accommodates every sensitivity level with a vast scope of settings. With 8 massage types, 16 different modes, 20 strength levels, 2 independent channels and a 10-60 minute adjustable timer, you will find the perfect pulse in no time. Humanized Design: Lock or unlock all settings by pressing the middle round button for 3 seconds to avoid accidental changes. Automatically shut off when massage time is due. Dual output channels for adjusting intensity separately.