There are other tags that are read only, featuring factory-specific serial number that acts as the key to the database, or perhaps write/read, where particular object data can be written on the tag by the user of the system. The programmable field tags might be read multiple or write once; while ‘blank’ blank tags might be written using electronic products coded by the user.
RFIDs usually feature two basic parts that include:

• The antenna: It receives and transmits signals
• Integrated circuit: for keeping and processing information, demodulating and modulating radio frequency signal and gathering incident reader signal among other specialized functions

The fixed readers are established for creating particular interrogation zones that are highly controlled. This provides highly defined reading zones for tags coming in and out of the interrogation zones. The mobile readers might be mounted on vehicles and mounted or hand-held carts.

Benefits of RFID:
• Ascertains patients receive correct medical appliances and drugs
• Hinders distribution of sham medicinal devices and drugs
• Supports device recalls
• Improves management of equipment, e.g. in hospitals
• Provides data required for electronic medical record systems
• Providing data required for efficient storage of electronic medical records

So far, there are no reports of any side effects attributed to use of the RFID tags.