noun which may take the genitive case particle 'no', noun
in-ear; canal-type; closed-fit
Describes headphones or earphones that insert into the ear canal, providing a tight seal. Often contrasted with open-type or earbud designs. The term カナル型 is also common.
See also: カナル型
Canal-type earphones have high sound isolation.
Wireless in-ear models are popular these days.
From English 'canal' plus 式 (style/type). A technical term for in-ear audio devices.