Is an input device. i presume u mean in computing. its any external hardware that can be connected to ur computer to help move something or input something on the screen. e.g. mouse keyboard, graphics tablet. i suggest googling the right word
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None, as imput is not a real word. If you mean input then the Scanner, as it inputs data into the computer. The others are output devices. The printer outputs text or image on paper, the monitor outputs visuals and the speaker outputs sound.
Disregarding Official Traffic Control Device
* a device that responds to mechanical strain. with a small change in resistance. ... * device for determining the amount of strain (change in dimensions) when a stress is applied
cassette
He was using a device where you prick your finger and let blood drip onto the device and it tells you things about yourself.