開放 かいほう がたヘッドホンでしょう
kaihōgata heddohondeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 開放型ヘッドホン

1. Open-back headphones, likely.; Probably open-back headphones.

Polite
Presumptive
Conjecture