RFID or Radio Frequency Identification Tag Reader has revolutionized the way we live. RFID tag reader has made it possible to track any type of object by using radio frequency technology.

RFID tag is a microscopic transmitter that is embedded in objects. It can also be embedded in humans and animals. The RFID tag reader then sends an electronic signal to the embedded tag. The RFID tag responds to this signal by sending back a radio frequency signal. This signal can give the location of the object along with the product information. However, there are more complex RFID tags that can give detailed and thorough information.

RFID tags have many uses. RFID tags can be used to identify patients in hospitals, prevent theft, track shipments, and detect earthquake. RFID tag can also be used for animal identification. However, at present the most prevalent use for RFID tags is tracking merchandise. Retailers are using RFID tags to check on their merchandise to see whether they are in the premises or being transported. Some countries like Malaysia, UK and the US are now using RFID tags in passports.

At different frequency radio waves behave differently. UHF or Ultra High Frequency RFID tags offer unique benefits. UHF tags operate at 850 to 900 MHz and can be read from a distance of up to 20 feet. However, data transfer is slowed down by metal and water. UHF tags are economical to purchase but require more power to operate.

An SDIO or Secure Digital Input / Output card is a complete hardware accessory. Examples of SDIO cards include Wi-Fi and Bluetooth adapters, GPS receivers, TV tuners, cameras, RFID readers, and fingerprint readers.

A device has to be SDIO capable in order to be compatible with SDIO cards. While a device with an SDIO card slot can accept standard SD (Secure Digital) memory cards.