As we already mentioned in our How ATMs Work section, an ATM has two input devices:
The four output devices of the ATM Automated Teller Machine are:
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Speaker – The speaker provides the cardholder with an audio signal when a key on the keypad is pressed.
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Display screen – The display screen guides the cardholder through each step of the transaction process. Leased-line ATMs usually use a monochrome or colour CRT (cathode ray tube) display. Dial-up machine normally use a monochrome or colour LCD (liquid crystal display).
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Receipt printer – The receipt printer provides the cardholder with a paper receipt of the transaction.
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Cash dispenser – The safe and cash-dispensing mechanism are located deep inside the ATM Automated Teller Machine. This mechanism stores and dispenses cash when prompted by an ATM user.

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