Into areas where there is a signal from the reader, which will cause a wave electromagnetic fields this is the wave, electromagnetic fields. Electric power generation label, send data back to the reader.
Into the area where the signal from the reader, which are electromagnetic. , which are electromagnetic. Make labels to create electricity to send information back to the reader.
into the signal from the reader, which can cause electromagnetic field on electromagnetic field, which will เกิดคลื่ The label create electricity send information back to the reader