Silicone Invisible Posture Corrector Anti-HumpbackFeatures: Made of food grade silicone material, it is lightweight and durable, soft and skin friendly, not easy to deform, fits the human body curve, and is comfortable to wear. The built in high precision gyroscope chip is better and more stable than the ball chip on the market, which can accurately record the posture, monitor the change of the body inclination angle in real time, and vibrate to remind. The automatic memory function can intelligently