Back scatter tags are capable of being programmed with varying amounts of information. Some tags may be re-programmed by a reader, others have the ability to store additional data from readers to their internal memory. The tag may be polled or transmit freely. Data may be read only or programmed by the interrogator. Radio Frequencies Used - 78,000 Hz to 5,600,000,000 Hz.
Affects range, reliability, and cost.
US and International Regulations. Lack of Standards - Microchipping of companion animals in the US is an example of one of the industry failures due to the lack of an industry standard. See Microchipping Your Pet for more information. Many proprietary protocols. Few international standards.