同学你好，该知识点来自沪江网校《2023考研VIP协议班【英语一】（渠道专享）》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学好，
cordless是无线的意思， 指的就是同学说的mobile phone or smart phone。

cordless
adjective
UK  /ˈkɔːd.ləs/ US  /ˈkɔːrd.ləs/

A cordless electrical tool or piece of equipment operates without needing to be permanently connected by a wire to an electrical supply.
无线的，无绳的
a cordless drill/iron
无线电钻／熨斗

https://dictionary.cambridge.org/dictionary/english-chinese-simplified/cordless

Have a  good day!