Slendertone system is the future of body toming & wellness, giving you the body shape you desire. This revolutionary new concept allows a single hand held controller to be attached to a range of garments, which tone different areas of your body. Discreet & rechargeable. Independant clinical trails have shown Slendertones patented c.s.i technology delivers a firmer, flatter stomach in 4 weeks. belt fits waist sizes 24"-44"/61-112cm. Slendertone uses the only clinically proven EMS technology, exercising all of the muscles of the abdomen not just those under the belt. A signal is sent to the nerves which are connected to all of your abdominal muscles.