Meet the PFO GPS Bracelet: a GPS device with an alarm mechanism to help get you out of trouble. It communicates SMS and Data via GPRS, GPS/GLONASS for outdoor positions and GSM triangulation for indoor positioning. You can pull the bracelet to trigger its alarm. The alarm mechanism locks the bracelet on your arm and updates your position every 20 seconds. You can press its button twice to get the current location. You can also locate your bracelet using its app.