[Built in Smart Chip] : The adjustable back straightener boasts an intelligent chip and angle monitoring sensor for real-time monitoring and posture correction in a timely manner. [Vibration Alert] : Featuring vibration reminders, this posture corrector offers scientific correction and automatic memory function to help change bad habits in just 2 hours a day over 3 weeks. Spec: Item Type: Posture Corrector Material: Nylon, ABS Product Battery Type: Lithium Battery (Shipped With Built In Battery) Battery Capacity: 200mah Charging Interface: USB Universal Interface Charging Voltage: 5V Rated Charging Voltage: 5V Rated Power: 0.4W Charging Time: 2H Package List: 1 x Posture Corrector 1 x USB Charging Cable 1 x Instruction Manual How To Use: After wearing straight back and head up, then click the switch, vibrate three normal work, maintain the correct posture until the posture corrector vibration three, at this time the intelligent chip has recorded your correct posture, when you appear hunchback arc more than 25 degree, the posture corrector will automatically sense vibration to remind you of bad posture, long press to close

[Vibration Alert] : Featuring vibration reminders, this posture corrector offers scientific correction and automatic memory function to help change bad habits in just 2 hours a day over 3 weeks. [Built in Smart Chip] : The adjustable back straightener boasts an intelligent chip and angle monitoring sensor for real-time monitoring and posture correction in a timely manner. [Angle Sensing] : Correct bad posture with this posture corrector equipped with angle sensing technology. it immediately vibrates to remind you when hunchback bending exceeds 25 degrees, suitable for adults and children. [Easy to Use] : Enjoy 15 days of usage after just one hour of charging with the 200ma high-capacity battery. the back brace features a well-positioned switch for easy by both adults and children, along with fine stitching and a high-quality nylon belt. [Ergonomic Design] : Designed in a figure 8 shape, this back straightener fits the body curve ergonomically, made of rubber material that is stretchy and comfortable without causing discomfort.