Cell Phone Strap
Mobile Phone Strap
noun
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.
けいたいすとらっぷ
けいたいストラップ
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.
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.