bells and whistles
  1. (idiomatic) Extra features added for show rather than function; fancy additions or features.
    Synonyms: gadgetry, trivialities, frills and furbelows
    Antonyms: plain, no-frills, normal, ordinary, simple, unadorned
    His new car has all the bells and whistles, but it doesn't move through traffic jams any faster.
    The bells and whistles do not impress me.
    I need a new phone, but I don’t want all those fancy bells and whistles on it!

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