The Smart Back Posture Corrector Brace is designed to help improve your posture and prevent slouching. It features an intelligent sensor that can detect when your back is bent more than 25 degrees, and it will immediately activate a vibration alarm to remind you to straighten up. Additionally, the sensor can also detect abnormal tension in your shoulders and vibrate to remind you to relax. This smart design ensures that you maintain a correct posture throughout the day. The back corrector is equipped with a 500mAh polymer lithium battery, which provides a long standby time of approximately 15 days. It only takes 2 hours to fully charge the brace using the included USB cable. The switch has an indicator light that turns red when charging and blue when fully charged or in normal working condition. If the reminder does not turn on, simply charge it for 10 minutes. The high-elastic nylon belt is easy to adjust and provides better elasticity and comfort. It is suitable for people weighing between 15 kg and 95 kg. The shoulder strap is made of porous mesh, ensuring breathability without feeling stuffy. It is designed to be comfortable and can be worn all day without digging into your armpits or hurting your skin. Wearing the posture corrector for 2 hours a day is recommended for best results. It takes approximately 21 days to form a habit and see significant improvement in your posture. If you continue to use it for 90 days, your improved posture will become a stable habit. This corrector is designed to promote long-term muscle memory and help you maintain a correct posture even without wearing it. If the corrector does not vibrate accurately, please refer to the USE TIPS provided. As an excellent Amazon brand seller, we provide 24-hour high-quality customer service, so you can purchase with confidence. If you have any questions or concerns, please don't hesitate to contact us. We are always here to assist you. Key Features: Intelligent sensor detects bent back and activates vibration alarm Vibrates to remind you to relax when tension in shoulders is abnormal Long standby time of approximately 15 days Easy to adjust high-elastic nylon belt for better comfort Breathable shoulder strap made of porous mesh Promotes habit formation and long-term muscle memory Comes with USE TIPS for accurate vibration Excellent Amazon brand seller with 24-hour customer service