A personal distress beacon. While these types of devices nothing new to emergency officials, the increasing availability of such instruments to the general public is becoming a popular subject.

The following is a statement from the manufactures of this device, ACR ELECTRONICS:
The Worlds Smallest Personal Locator Beacon. Learn how at the push of a button, the ResQLink can initiate a Search and Rescue team to your exact location.

Now FCC Approved and Shipping to a specialty retailer near you.

http://www.acrelectronics.com
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Though initally designed to direct serach and rescue teams anywhere in the world to the locations of persons who may be adrift at sea or lost in a forest or some other area that is distant from civilization, I can see other applications for this device including it's use as tracking device to locate abducted children and adults.