I want to know the answer to the following question:
Activity trackers are an example of what?
All the background I'm provided with is that "Smart phones, tablet computers, smart watches, and other mobile devices such as Quantified Self devices like activity trackers have also become targets and many of these have sensors such as cameras, microphones, GPS receivers, compasses, and accelerometers which could be exploited, and may collect personal information, including sensitive health information.". Is that enough to answer the question?
Answer: yes