1. Input Devices
1.1. Microphone
1.1.1. An acoustic-to-electric transducer or sensor that converts sound into an electrical signal. In computers they are used for recording voice, speech recognition, VoIP, and for non-acoustic purposes.
1.2. Keyboard
1.2.1. Used for typing in information in computer, challenge can be: may cause carpal tunnel in some people
1.3. Mouse
1.3.1. Can be used with the right or left hand, Right and left button can be clicked to input items, challenge is may cause carpal tunnel in some people
1.4. Webcam
1.4.1. Feeds images in real time into the computer
2. Output Devices
2.1. Printer
2.1.1. Produces an electronic document on printed media, challenge can be to make sure the settings are correct for desired output, and printer ink (toner) can be expensive
2.2. Monitor
2.2.1. Displays visual output, a screen that displays output from a computer, challenges can be difficult to see in a group, or by someone with visual issues
2.3. Speakers
2.3.1. For listening, produces sound in response to an electrical audio signal input, challenges can be the volume comfort for multiple listeners