Microphone
Check if your microphone is working, and see information related to audio-input devices.
Webcam
Test your webcam connected to the device, and check information about it like resolution, etc.
Speakers
Sometimes, your speakers don't work. Useful for checking whether an audio device works or not.
GPU
Shows information about the GPU in the device. Useful for checking the specs, etc.
Controller
Plug in a controller to check if everything's working fine, so you don't lose another game.
MIDI
Check if your MIDI devices are working properly, and see information related to them.