Computing Devices includes all the devices which do computing by themselves or are required for performing computations.It includes all the computer hardware like cpu,video card,lan card,touch screens,cell phones,calculator etc.

 To add to what mr. Amag443
1)mouse
2)'audio card
3)blue tooth [r/c device to handle telephone calls through computer]
4)wireless transmitter\receiver [each a different device]
5)hard drive
6) cd rom, cd dvd rom[read, read\write, plus[+]minus[-] [each a different or in one package device.