Mobile Phone Strap
Noun
けいたいすとらっぷ
けいたいストラップ
あの携帯ストラップが気色悪すぎて、考えるだけでも吐きそうだわ。
The cell phone strap is so gross just thinking about it makes me puke.
You know how 携帯 refers to a mobile phone? This is a strap (ストラップ) for a mobile phone, making this a cell phone strap or mobile phone strap.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own. Will help to know the reading of 携帯.