noun
extension telephone; additional handset
A telephone handset connected to a main unit (親機), typically used in a home or office. Often refers to a wired extension.
See also: 親機 (おやき)
親機に加えて、子機を2台購入した。
In addition to the main unit, I bought two extension handsets.
noun
cordless handset; portable telephone
Specifically a cordless (wireless) handset that communicates with a base unit. Often used for home cordless phones.
コードレス子機を充電器に戻してください。
Please put the cordless handset back on the charger.