noun
Refers to a device that sends signals, data, or power, typically in radio, telecommunications, or electronics contexts.
このトランスミッターは最大100メートルの範囲で信号を送れます。
This transmitter can send signals up to a range of 100 meters.
レシーバー is the receiver counterpart; トランスミッター sends, while レシーバー receives.
Borrowed from English 'transmitter'.