| 摘要 |
An audio device comprising a casing containing a circuit and a spool rotatable about an axis, two earpieces connected by lead wires, the lead wires being wound onto the spool so that the earpieces are deployed or retracted as the spool rotates, the spool including two or three concentric circular tracks each track being connected to a respective lead wire, a contact within the casing being each arranged to engage a respective track as the spool rotates to connect the earpieces to the circuit.
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