People who are fully vaccinated will have a less severe illness and are much less likely to be hospitalized or die than people with similar risk factors who are not vaccinated.
A wide range of online video portals are supported, including YouTube, Dailymotion and Vimeo.
The Pfizer vaccine should be given 21 days three weeks apart and the Moderna vaccine should be given 28 days apart one month.
The ring's position and diameter are designed for easy use.