This area is monitored 24 hours a day by security cameras.

He installed a hidden camera in the room.

Whenever he takes a picture, he always gazes directly at the camera.

I'm looking forward to shooting a movie with my new video camera.

I talked to him through the intercom.

I bought a new headphone.

I bought new earphones.

I would be in trouble without my mobile phone.

He started his speech using a microphone.

The Naizō-ryō played an important role in Japanese history.