INTELLIGENT POSTURE REMINDER: The corrector features the latest inductive design. When the user's back bends more than 25 degrees, the device automatically senses the posture change and activates a vibration alert. When shoulders bend forward or muscle tension becomes abnormal, the sensor vibrates immediately to remind the user to adjust. LONG STANDBY TIME: The back corrector is equipped with a 500mAh polymer lithium battery, providing up to 15 days of use after a 2-hour charge. It can be easily charged using a USB cable. The power switch has an indicator light: a steady red light indicates charging, while a steady blue light indicates a full charge or normal operation. If the device does not turn on, charge it for at least 10 minutes before use. HIGH-ELASTIC NYLON BELT: The adjustable high-elastic nylon shoulder straps offer superior elasticity and comfort, suitable for users weighing between 15 kg and 95 kg. The straps are made of breathable mesh material, preventing stuffiness and ensuring all-day comfort. Designed to avoid digging into the armpits or causing skin irritation, it allows for extended wear. SCIENTIFIC AND EFFICIENT CORRECTION: It is recommended to wear the posture corrector for 2 hours per day. 21 days is the typical period for habit formation, during which posture shows noticeable improvement. Continued use for 90 days helps establish stable postural habits. This process supports long-term muscle memory development. For optimal vibration accuracy, refer to the usage instructions provided. Specifications: Battery capacity: 500mAh / 3.7V Power supply: 5V Power consumption: 0.4W Charging time: approximately 2 hours Charging voltage: 5V Net weight: 85g Material: ABS + elastic nylon belt Charging interface: standard V8 USB interface