Vibro-acoustic describes the combination of sound and vibration. High Frequency headphones rest just in front of your ears and add a tactile dimension to listening.
The headphones and app have different roles. The app creates your listening session. The headphones deliver the audio with a vibration you can feel at the contact points.
The open-ear shape leaves your ear canals uncovered. Fit and comfortable volume still matter. Follow the product guide, and take breaks when you need them.