Dual frequency radio-frequency identification device

A method comprising:

• detecting, by a controller, an electromagnetic field at at least one of a first frequency or a second frequency, the first frequency and the second frequency being different frequencies, and being frequencies separated by a factor of 100;
• and
• transmitting, by the controller, data to a first radio-frequency identification (RFID) or a second RFID reader based on the detection, the transmitting comprising:
• transmitting, by the controller, the data to the first RFID reader at the first frequency via a first antenna associated with the controller when the electromagnetic field is detected at the first frequency and when the electromagnetic field is detected at the first frequency and the second frequency;
• and
• transmitting, by the controller, to the second RFID reader at the second frequency via a second antenna associated with the controller when the electromagnetic field is detected at the second frequency.

A method comprising:

• winding a first plurality of conductive turns to form a first antenna;
• winding a second plurality of conductive turns to form a second antenna;
• arranging an integrated circuit comprising a controller and a non-transitory computer readable storage medium between the first antenna and second antenna;
• and
• galvanically connecting the integrated circuit to the first antenna and to the second antenna.