Which device is not typically considered a computer accessory?

A flash drive is primarily considered a storage device rather than a peripheral or accessory of a computer. While it interfaces with a computer and is essential for data transfer and storage, its main function is to hold data rather than facilitate direct interaction with the computer or provide input or output capabilities in real-time.

In contrast, a mouse is used for input, allowing users to interact with the computer's graphical interface. A microphone serves as an input device as well, capturing audio for various applications. A monitor provides output by displaying visual information from the computer. These devices are considered accessories because they directly enhance the user’s ability to interact with the computer system or receive information from it. Thus, while the flash drive interacts with the computer, it does not fit the conventional definition of an accessory in the same way the other devices do.