An in-ear earphone is provided having a housing (50) for receiving an electroacoustic transducer and an expansion adapter unit (20) coupled to the housing (50) of the in-ear earphone. The expansion adapter unit includes an extension unit (20) having an upper portion (26) with a curvature for conforming to a Crus Inferius Anthelicis, an anti-helix, and / or a concha of an ear of a user. The expansion adapter unit further comprises at least one coupling element for coupling the upper part (26) to the housing (50) of the in-ear earphone, the extension unit (20) having at least two flexible legs (22, 25) as coupling elements, one leg (22) is coupled to a first end (28) of the upper part (26) and a second leg (25) to a second end (29) of the upper part (26).
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