Crystal oscillator
It generates electronic signals. If it fails, the memory key will not be able to do anything. In the case of radios, the crystal oscillator adjusts the frequency of the recording.
6 LED (Optional)
LED bulbs are optional and optional. The main thing is to have a light and signal when you are using it.
7 Write-protect switch (Optional)
Write protect prevents access to the memory key. To prevent access; It prevents the internal data from being changed. This includes and does not include.
8 Space for second flash memory chip
Roughly, it looks like a separate compartment on another chip for memory storage.