You can definitely share Willo with several members of your household. We have included colored smart rings so you know which is mouthpiece is yours in a glance. The smart rings also allow you to link your mouthpiece to your own personal profile on the Willo mobile app.
Sharing Willo with several persons is also safe. The device has been designed to prevent cross contamination and bacterial growth as much as possible, when regularly cleaned with the Willo disinfecting solution (see cleaning of Willo).