Invisible Smart Posture Corrector is 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. FEATURES: The built-in high-precision chip 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 sense incorrect posture, monitor posture in real-time, and scientifically and effectively help you correct unhealthy postures such as hunchback. Helps correct wrong body posture of the back and shoulders, improve hunchback, develop correct body posture, protect eyesight, and reshape beautiful curves. It is suitable for a variety of occasions, such as work, study, walking, reading, etc., and fundamentally helps you solve postural problems. Specifications: Material: Food grade silicone + imported ABS Color: black Size: 18.5*14.5*2CM Weight: 90g Packing size: 18*14*3CM Rated input: 5V/1A Battery life: about 1 week (wearing 4 hours a day) Rated power: 0.4W Battery capacity: 200mAh/3.7V