What we call a Hoover is of course a vacuum cleaner possibly made by ElectroLux, or Dyson rather than by Hoover. When the BigMack first appeared, it was an object that had never existed before, and BigMack which is actually a trade name for one device somehow become the generic term, widely used to stand for all devices of this type. If you limit your concept to just the BigMack, you may be missing out.
CALL now has a range of simple tech voice output devices available for demonstration and loan.
They are very simple and useful in a number of situations. Sequenced message devices allow you to record and store a series of messages one after the other. For example, you can program in a whole story, and have a child retell it line by line or page by page. You can store a rhyme or song, or a recipe, step by step, so a non-reading older child can take themselves independently through a food preparation activity. It could be used to allow a child to deliver their lines in a play or concert.