Rechargeable smart sensor posture corrector 1.smart sensor, vibrate to alert when back bend over 25â° 2.eliminates neck and back discomfort from sitting with rounded shoulders in front of the computer 3.lightweight high elasticity nylon corrector can be worn comfortably under or over clothing. 4.smart posture corrector vibrates automatically to remind users of their incorrect posture 5.easily get perfect confident posture - start standing, sitting much straighter. 6.adjustable length, suitable all ages male and female usb electric smart posture corrector back support belt braces back posture orthopedic goods spine posture vest backbelt support.