Which of the following features does a headset typically include?

A headset typically includes a microphone attached to it, which is a key feature that distinguishes it from other audio equipment, such as speakers. This microphone allows for clear audio input during communication, whether it's for phone calls, video conferencing, gaming, or other applications.

The inclusion of a microphone is essential for facilitating two-way communication, making it usable in various environments, such as offices and home settings. Users can engage in conversations without the need for a separate microphone, providing convenience and a streamlined experience.

Other features like a built-in speaker system may be common in some audio devices but are not a defining characteristic of headsets, as they typically consist of both ear cups and a microphone. A camera for video calls is not a feature of headsets. Similarly, while certain high-end headsets may offer wireless capabilities, the presence of a wireless charging option is not standard across typical headsets. Thus, the microphone stands out as the most integral and ubiquitous feature among headsets, making it the correct answer.