| 摘要 |
An active two way radio tag (e.g. used for tracking assets, people or livestock) operates below 1 MHz and includes an integrated circuit operable to generate and transmit data signals at a frequency below 1 megahertz, a timing circuit (e.g. a crystal), for controlling the frequency, and a battery or other energy source operable to energize said integrated circuit and said timing circuit. The active tag may further include a data storage device (e.g. a static or dynamic memory) operable to store data identifying the tag.
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