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.
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The Holter monitor is a device attached to the body to monitor heart activity. It is worn for a period of time and records and monitors the heart for abnormal rhythms as well as other cardiac disorders. The long period of time helps find problems that a shorter test may not pick up.
Disregarding Official Traffic Control Device
The ETC is an automatic payment device for the toll roads in Japan. Most hi-ways are toll roads and the tolls are not cheap, most ranging from 240 yen to 1680 yen ($2.50 to $17.00). You can run into as many as seven of these toll booths in a normal commute. The device is mounted in your car with a sensor. It has a card slot to insert a pre-paid card which allows you to blow through the ETC lane in the toll booth. Each pass through the toll booth gets deducted from your card. The device also has a speaker which notifies you of an upcoming toll booth as well as a low balance on your card (but is only useful if you speak Japanese). The card can be recharged at most convenience stores.
* 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