| 摘要 |
<p>An apparatus and method for tracking an object includes a transmitter that generates a signal and a receiver that receives the signal generated by the transmitter The receiver generates an alert signal when a distance between the transmitter and receiver is greater than a predetermined value The receiver is retained in a retaining element, such as a wrist band, while the transmitter is secured to an object The receiver is programmable to generate the alert signal only when the predetermined distance has been exceeded The retaining element optionally includes multiple retaining features so that multiple receivers may be retained in a single retaining element Each receiver is programmable to communicate only with one corresponding transmitter by assigning each transmitter/receiver pair with a unique identification code The unique identification code expires after use so that each transmitter may only communicate with a single receiver</p> |
