Features18 Shape brace stretch, open shoulder straight back, adjustable shoulder strap, stable stretching force. 2Helps correct poor postural habits and ease neck, back and shoulder pain,easy and convenient to use. 3Allows you to actively adjust the correct posture through vibration prompts without being restricted by traditional correction bands. 4There are three magnets on the back, which can stimulate the acupoints to relieve discomfort and correct the back posture. 5Vibrate to remind design, more effective to improve self?awareness of back straightening, especially suitable for sedentary people and students homework time.SpecificationItem Type: Posture CorrectorMaterial: SBR+ Polyurethane +PU Magnet Battery: Built-in lithium battery 500MAHWear steps:1. Adjust the straps to a suitable length and wear them well2. Press the power-on indicator light in the center of the back3. Maintain the correct posture, reminder will record the correct posture4. The correction belt will vibrate to remind when there is bad postureWear two hours a day, develop the habit of straightening backSize ShoulderWeight S 26-36cm / 10.2-14.2in15-40kgM35-45cm / 13.8-17.7in40-70kgL42-48cm / 16.5-18.9in70-95kgPackage List1 x Posture Corrector 1 x Charging Cable