1Rings design: Posture trainer is different from the traditional posture correction belt form, which is convenient to put on and take off and wear it without feeling. 2Change your posture: Improve your posture from the root cause, and let you go from a habitual hunchback to a natural upright posture. 3Change habits: Improve bad habits for hunched back, round shoulders, high and low shoulders by exercising the principle of back muscles. 4Method of use: Smart corrector is recommended to wear it for 2 hours a to form a stable muscle memory. 5Smart monitoring: Real time monitoring of bad postures such as hunchback, high and low shoulders through smart sensors to help you take the initiative to develop good posture habits. Item Type: Posture Corrector Material: Silicone, ABS Battery Type: Battery Capacity 600mAh Built in Lithium Battery ( with Built in Battery) Use Time: 50h Charging Time: 1.5h Communication Method: Low Energy BT 4.1 and Above 1 xPosture Corrector 1 x USB Cable 1 x User Manual The USB interface is not waterproof and cannot be washed as a whole, but sweating will not affect the operation of the device.