An active RFID device has an internal power source that powers the integrated circuits and broadcast the radio signal to the reader. The active RFID device transmits at a higher power level than a passive device. The higher power level of transmission enables the device to broadcast at longer distances, and can be applied in various scenarios.
Active RFID devices are bigger and more expensive to produce. The Active Proximity Badge is an example of an active RFID device.
The Active Proximity Badge works when the badge is in a certain range from the reader. When you walk away from the reader, the computer locks. When your badge is in the range of the reader, the computer unlocks. This scenario is true given that no obstacles are blocking the area between your badge and the reader.
Your badge automatically switches off after nine hours of use. When the badge is switched off, the reader does not detect it. It must be switched on.
See the following topics for more information.