Explanation:

A barcode reader is an optical scanner that can read printed barcodes, decode the data contained in the barcode and send the data to a computer.  Like a flatbed scanner, it consists of a light source, a lens and a light sensor translating for optical impulses into electrical signals.
A graphics tablet (also known as a pen tablet, drawing tablet or digitizer) is a hardware input device used primarily by digital artists, though many non-artists use them as well. Graphics tablets have a hard plastic, touch-sensitive drawing surface that transfers stylus or mouse movements to a monitor.
A magnetic stripe reader, also called a magstripe reader, is a hardware device that reads the information encoded in the magnetic stripe located on the back of a plastic badge.
A numeric keypad, number pad, numpad, or ten key, is the palm-sized, 17-key section of a standard computer keyboard, usually on the far right. It provides calculator-style efficiency for entering numbers.