Back & Lumbar Support Cushions features:Humpback is also a kind of spine deformity. It not only affects a person's physical beauty, but also stretches the ligaments in front of the chest and affects respiratory function. It is easy to induce myocardial infarction, syncope, and asthma. With our humpback corrector, you can easily solve your problems. The best choice for you. FeaturesColor:BlackMaterial: ABSSize: Approx.10.40X8.60X2.00cm/4.09X3.38X0.79in.-Rated Voltage: 3.7V.-Rated Power: 0.22W.-Rated Current: 0.06AAdoption of high-qualityABS material,sturdy and durable for long-term use.-If the bending angle of the hunchback exceeds 25, the corrector will vibrate immediatelyThe cross 8 shape ergonomic design will fits the human body curve, comfortable to wear.-It can not only improve your physical beauty, but also reduce the likelihood of myocardial infarction, syncope, and asthmaA wonderful gift for your family and friends who have humpback problems, and they will like it.