BackPal is a medically approved audio posture-correcting device. It is designed to help you develop healthy body posture habits. 

Designed by a doctor of Rehabilitation and Physiotherapy, BackPal works on a simple biofeedback principle, which allows effective control of body posture and prevents long-term spinal problems.

Worn over the shoulders, like the straps of a rucksack, BackPal 
gives off a high-frequency warning sound when you slouch, sit or 
stand in a poor body posture position.