Slendertone ReVive S5 Pro Muscle Conditioner & Stimulator - EMS Toning and TENS Therapy Device Improve overall muscle performance and rehabilitate, soothe and relax sore and tired muscles Clinically-proven EMS/TENS technology to promote muscle recovery, rejuvenation and relaxation Helps release tension and stress from tired muscles by delivering a massage-like action to increase blood flow and reduce lactic acid build-up Soothes and stimulates multiple muscle groups with 6 unique programs and up to 99 adjustable intensity levels for a customized, comfortable session for beginners to fitness enthusiasts FDA cleared, safe and easy-to-use. With over 50 years of medical expertise and extensive user evaluations, you can be confident Slendertone products deliver results.