The interrogator or reader, which, depending upon the design and the technology used, may be a read or write/read device (in this site — in accordance with normal colloquial usage — the data capture device is always referred to as the reader, regardless of whether it can only read data or is also capable of writing)
| Low Frequency Readers (125-134.2 kHz) | High Frequency Readers (13.56 MHz) | Ultra High Frequency (860 and 960 MHz) |