Improve maximum muscle strength of the biceps and triceps and save time while exercising both arms at once;High Performance Muscle Training System - clinically demontrated EMS technology;Convenient and easy-to-use with custom programs for beginners to fitness enthusiasts with 3 Training Programs and 99 Levels;FDA cleared to tone, firm & strengthen the major upper arm muscles with results you can see and feel;Requires the FLEX BELT CONTROLLER (sold separately).
