Designed for exercise to reduce your fat and to build beautiful shape when you swing your waist to rotate the ring.Detect and record your exercise time, revolution, speed, and indicate your fat and calorie. You play in music, the voice inform your exercise result. Full of funRecommend you a proper exercise strength based on your age, sex, weight and pulse, the auto-detect system monitor your pulse and activity strength, suggest you work at the best condition. It is safe and useful for loose weight.Tied up to your belly or waist, can be played in more than 30 ways, to shape your belly, back, waist and leg through burning your fat and superfluous fresh.. It builds your beautiful body!Enhance your flexibility and harmony.