A removable component for use with an earphone is disclosed. The envelope sheet is configured to be, in a stuff and seal apparatus, preliminarily folded at the second fold line while a content is stuffed thereinto, and then fed forward together with the content by at least two pairs of the feed rollers. The hinge assembly includes a flexible strap and biasing element capable of tensioning the flexible strap to maintain the first and second base portions with respect to each other in an open configuration. The scannable latch also has an output gate operatively connected to the dynamic input stage and shadow latch.