Smart Posture Corrector: Helps you maintain good posture and prevent and improve hunchback. Smart reminder: Built-in smart sensor vibration reminder, can detect abnormal posture, when the hunchback is bent over 25 degrees, immediately vibrate to remind Develop good: wear it 2 hours a day for 3 weeks to improve hunchback, keep your head up and your chest up, it can change your posture through angle and tension sensing. Adjustable strap: The strap is made of soft and breathable material, adjustable, suitable for adults, teenagers and children. Portable: Built-in large capacity battery, USB rechargeable, with indicator light, easy to use anywhere, can be carried at home, work, study, outdoors, office, shopping or on any other occasion