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There is no need for a lady to count the dumbbell's going up and down anymore,while she is exercising with it for the purpose of losing weight.
After pressing down the start button,it'll rotate back as one exerises with it.Meanwhile,the lights on the both ends will show the level of calorie bumt by giving off a sequential lights ranging from blue to red.That is the concept of letting dumbbell tell you how much energy you have consumed。
huazhong university of science and technology