OGS Theory
Since the drive unit of traditional earphone is small and its low pitch effect will be lost easily, the traditional earphone must be occluded well to block ear canal as resonating space for low pitch sound performance.  However blocking the ear canal bring following problems to people who have experience using traditional earphone.
Traditional earphone problems	1. Earholes hurt: Traditional earphone occluded into ears that makes people hurt during long listening sessions. 2. Hearing exhausted: Blocking ears to receive accumulated sound pressure (limited frequency sounds) leads to hearing exhausted and damaged during long time listening sessions. 3. Isolation danger: Hearing isolated from surroundings, leads to alerts and risks misjudged that is most dangerous.
OGS earphone solution	Solution: OGS (Open Guided Sound) OGS is non-occluding “open fit” design that rest the OGS earphone outside the ear canal to solve traditional earphone problems and give consideration of the audio quality as well.    People may enjoy clear, undistorted and “front-row” sound delivered to nature’s biological amplification system.