| 摘要 |
A radio frequency transmission device including electronic circuitry. A digital logic circuit is alternate-able from a sleep mode to an active mode after a pre-determined time period, and back to the sleep mode immediately after transmission of a digital signal. The digital signal includes a unique and pre-determined sequence of fixed length pulses routed to a transmission circuit to transmit a radio signal in a specific frequency range. An output display signal from the output circuitry is displayed with an LED. An input circuitry is manually activated. A radio frequency signal is received with a receiver circuitry, sensed to determine if the received signal has a compatible characteristic of an expected signal. The radio frequency signal is converted into a digital form and sent to the microprocessor. Every associated transmitter device is tracked with a counter maintained by a microprocessor. Personnel, belongings and pets can be tracked with this device.
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