Achieve better posture with the Strack Smart Posture Corrector! The trainer vibrates every time you slouch to help you develop better form quickly. Wearing Strack on your upper back, you can use the included magnet or the adhesive. With the mobile app, calibrate Strack and easily monitor your improvements daily, weekly, and monthly. With an adjustable fit, you can set the vibrations and intensity to your level of comfort.