also: スピーカーホン · スピーカフォン
noun
speakerphone
A telephone with a built-in speaker and microphone, allowing hands-free conversation. Common in offices and conference calls.
会議中はスピーカーフォンを使って全員が話を聞けるようにした。
During the meeting, we used the speakerphone so everyone could hear the conversation.
スピーカーフォンに切り替えて、手が離せるようにしてください。
Please switch to speakerphone so you can free up your hands.