Which of the following is a common source of RF interference?

Wireless mice are indeed a common source of RF (Radio Frequency) interference. This is primarily because they operate using radio waves to communicate with their associated computers or devices. Most wireless mice use the 2.4 GHz frequency band, which is also utilized by many other consumer electronics, including Wi-Fi networks and other RF devices. When several devices operate on the same frequency, it can lead to interference, potentially disrupting the communication between your drone and its controller.

In contrast, while smart watches, GPS devices, and voice assistants might also utilize radio frequencies, their main functions and the types of frequencies they commonly operate on may not create interference in the same way or as frequently as wireless mice. For example, GPS devices typically operate on different frequency bands dedicated to satellite communication, which are less likely to conflict with the frequencies used by drones.