This abdominal toning belt works on the basis of electrical muscle stimulation (EMS). Used for many years by athletes, particularly for rehabilitation, gentle electrical impulses stimulate the abdominal muscles without stressing tendons or joints. This builds up the abdominal muscles passively, preserving mobility and reducing the risk of injury. The BOB Abdominal Muscle Stimulation Belt is from Medisana, German experts in home healthcare and monitoring for 30 years. Requires 3 x AA batteries.