ワイヤレスマイクロホンでしょう
waiyaresumaikurohondeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of ワイヤレスマイクロホン

1. Wireless microphone, probably.; It will likely be a wireless microphone.

Polite
Presumptive
Conjecture