⛑Nano Protection: Signi/Connexx utilizes nanotechnology in designing the Nanocare Wax Guard 3.0 to provide enhanced protection against earwax and debris, prolonging the life of the hearing aid. ⛑Disposable Filter: Signi/Connexx Nanocare Wax Guard 3.0 is a disposable filter designed to protect the receiver (speaker) of your Signi/Connexx hearing aids from earwax and debris.