Guardian-Angel Tracker Universal Digital Range Frequency Locator for Children , Pets , Cell Phones , Car keys & other Valuables - ** Free Bonus Black Holster Pouch for the Tags ** Works indoors and outdoors.(Unlike GPS Devices, which only work when the device can "see" the sky.) Light weight and easy to use. No assembly or installation needed. Safe 2.4GHz RF technology One Base can control up to four tags (two included in this package) The Base is equipped with a direction indicator to speed the search. Includes a free pouch for the Tags Alarm can be set to trigger at variable distances from approximately 16 feet, 32 feet, or 64 feet. 1,600 feet search radius (*Distance will vary depending on terrain and other factors.) Alert modes 95 dB Alarm and/ or vibration. Tags can transmit a Panic/ Stress alert to the Base.