Description: Intelligent Posture Corrector --- Smart Posture Corrector will vibrate alarm automatically to remind user when your back is bent forward more than 25 degrees, help you correct bad posture habits, keep you upright and more confident. Scientific Efficient Correction --- We recommend that user wear posture corrector for 2 hours a day. 21 days is the period of habit formation, and posture will be significantly improved, 90 days of persistence will enter the period of habit stability. Wear Invisible & Fit All People --- Upper straightener belt is compact size which you can wear it under clothes invisibly without anyone noticing it, can be worn at home, work, study, outdoors, office, go shopping any other occasions. Adjustable harness fit for children and adults, men and women. Comfortable to Wear --- High-elastic nylon fabric material is comfortable to wear without pressure on your shoulder and fit the human body curve. Shoulder straps can be adjusted to your most comfort length. Rechargeable & Long Standby --- Built-in large-capacity lithium battery and can be used for 15 days after 2 hours charging. The switch is with an indicator light, the constant red light indicates charging, and the constant blue light indicates full/normal working. Specification: Material: PC+ High elastic nylon belt Size: The size can be adjusted freely according to needs Charging: USB (with USB data cable) Package Includes:(3 Pack) 1 Piece Posture Corrector 1 Piece USB Charging Cable