Wikipedia
Slendertone
Slendertone is the brand name for the range of electrical muscle stimulation devices manufactured by the Irish company Bio-Medical Research Ltd. the company's Slendertone Flex product had been approved by the U.S. Food and Drug Administration for over-the-counter sale for toning, strengthening and firming abdominal muscles. , the Slendertone range now includes a device with a Bluetooth link to a smartphone app.