It's [i]way[/i] different, [b]DScott[/b]...
[b]9divdoc[/b], it looks like your image is actually for the short-range non-GPS implantable transponder —
[i]VeriChip is similar to the devices that have been implanted in millions of pets in the United States in recent years, which allow animal shelters to identify the pets and contact their owners.
The chip, which is slightly larger than a grain of rice and transmits two to three sentences of data, can be read by a scanner up to four feet away. It is injected into the subject's forearm or shoulder under local anesthesia during an outpatient procedure and leaves no mark, Bolton said.[/i]
The GPS-equipped transponder is still quite a bit bigger, and is not implantable:
[i]The second product, Digital Angel, which combines a global satellite positioning system and monitoring service, was designed with people who stray in mind, such as parolees or Alzheimer's patients. [b]The system combines a watch and a device the size of a pack of cigarettes that clips onto a waist band or a belt like a pager.[/b][/i]
Only a matter of time before they shrink it down enough to be implantable, though.