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  2. Cross-device tracking - Wikipedia

    en.wikipedia.org/wiki/Cross-device_tracking

    Now, cross-device tracking has evolved into a new, radical form of surveillance technology which enables users to be tracked across multiple devices, including smartphones, TVs, and personal computers through the use of audio beacons, or inaudible sound, emitted by one device and recognized through the microphone of the other device, usually a ...

  3. Portable People Meter - Wikipedia

    en.wikipedia.org/wiki/Portable_People_Meter

    Convinced that the concept could be achieved, Mr. Kolessar obtained approval from Arbitron's management to undertake a fast-track effort to determine feasibility. Lacking the internal expertise to do so, additional outside help from the company, Martin Marietta, was sought. Facing cutbacks in the defense industry, Martin Marietta agreed to take ...

  4. Tile (company) - Wikipedia

    en.wikipedia.org/wiki/Tile_(company)

    Tile, Inc. (stylized as tile) is an American consumer electronics company which produces tracking devices that users can attach to their belongings such as keys and backpacks. A companion mobile app for Android and iOS allows users to track the devices using Bluetooth 4.0 in order to locate lost items or to view their last detected location. [1]

  5. The best Bluetooth trackers for finding lost stuff in 2025 ...

    www.aol.com/lifestyle/the-best-bluetooth...

    Android and iPhone compatibility: Many trackers are designed for just one or the other operating system, so be sure to check for compatibility with your phone OS before purchasing. Some bluetooth ...

  6. GPS tracking unit - Wikipedia

    en.wikipedia.org/wiki/GPS_tracking_unit

    A GPS tracking unit, geotracking unit, satellite tracking unit, or simply tracker is a navigation device normally on a vehicle, asset, person or animal that uses satellite navigation to determine its movement and determine its WGS84 UTM geographic position (geotracking) to determine its location. [1]

  7. Cellphone surveillance - Wikipedia

    en.wikipedia.org/wiki/Cellphone_surveillance

    Cellphone surveillance (also known as cellphone spying) may involve tracking, bugging, monitoring, eavesdropping, and recording conversations and text messages on mobile phones. [1] It also encompasses the monitoring of people's movements, which can be tracked using mobile phone signals when phones are turned on.