The military uses them to monitor missions and troop movements. Athletes use them for training. Tourists, performance artists, video bloggers and podcasters love them. What are they? Personal surveillance systems, of course.
Personal surveillance relies on portable battery powered CCTV cameras. While these devices come in many sizes and shapes, they fall into two basic categories. Body cameras are usually worn on a helmet, hat or lapel, and mostly monitor things happening in front of the user. External cameras, the second category, record the user and the surrounding area. Both technologies make records of the user's interactions with other people.