From the Aetrex Website:   These innovative shoes feature the latest GPS tracking technology embedded in the base of the heel with location coordinates sent to a central monitoring station. When your loved one is wearing the Aetrex GPS Shoes, you will have the ability to quickly track and locate them at any hour of the day using the interactive tracking website service (contingent upon enrollment in a separate monthly tracking plan; tracking service only works within the United States and excludes Alaska & Hawaii).

Finally, this extraordinary footwear will provide the comfort and security for you and your loved ones.

http://www.aetrex.com/aetrex-gps-shoe/?cat