Smart back posture corrector with vibration sensor. easily get perfect confident posture - start standing, sitting much straighter align your shoulders, spine and upper back improve posture & reduce slouching immediately with easily adjustable dual strap design. lightweight high elasticity nylon corrector can be worn comfortably under or over clothing. eliminates neck and back discomfort from sitting with rounded shoulders in front of the computer. wear all day to retrain your posture- it's nearly invisible when wear under a shirt. electric posture corrector back brace spine stretcher lumbar vibration massager spine deck backbelt support usb rechargeable.