Wireless device for ambient energy harvesting

A wireless identification tag configured to harvest ambient energy and transmit an identification signal intermittently, the tag comprising:

• at least one transmitter, configured to transmit a first signal to a first receiver in a first frequency, and to transmit a second signal to a second receiver in the first frequency;
• at least one energy storage component, electrically connected to the at least one transmitter, for collecting and storing ambient energy and for powering transmission of the at least one transmitter;
• and
• at least one circuit connected to the at least one transmitter and to the at least one energy storage component, the at least one circuit being configured to monitor energy stored in the energy storage component, and to prevent the at least one transmitter from transmitting the first signal to the first receiver in the first frequency when the energy stored in the energy storage component is insufficient to transmit the second signal to the second receiver in the first frequency even if the energy stored in the energy storage component is sufficient to transmit the first signal to the first receiver in the first frequency.