| 摘要 |
<p>An in-ear device (1,1 ', 10O) comprises a main body (2) for placement in the outer ear of a wearer and has at least two derivative canals (24', 24", 24'") each containing a filtering medium (25', 25", 25'") differing from one another in terms of their frequency suppression capabilities, and a, preferably rotatable, knob (22,22') enabling selection of the respective filtering canal (24', 24", 24'") without the need for removal of the device (1,1 ', 100) from the ear.</p> |
