Magnetic Strip readers, Optical character readers (OCR), Optical mark readers (OMR), and Radio frequency identification systems (RFID).

Magnetic strip readers – Used to read loyalty and other cards.

Optical character readers (OCR) – Scan document into text.

Optical mark readers (OMR) – To input survey and multiple choice forms.

Radio frequency identification systems (RFID) – These are used for automatic identification and tracking, they have a radio frequency, electromagnetic fields to transfer data.

An RFID device is strapped around this persons leg.