Our Wireless Bluetooth GPS Finder is perfect for your hiking and camping activities! It is made of premium ABS material, making it highly durable even during extensive weather. It can easily link to your phone, either IOS 7 or above or Android 4.4 or above. You can either use the app when the internet is possible or via Bluetooth, but the distance is reduced to a max of 75 feet. It works at a predefined distance between the phone and the tracker, once that exceeds then, an alarm sounds alerting you so can check with the kids or pets.