Smart Key Finder: The Key Finder utilizes BT 4.0 technology to connect with Android, iOS, iPad, and other smart phones. It displays the distance of your lost car key, luggage, wallet, dogs, or cats from you on the APP, allowing for precise location. The 5-pack smart tracker locator includes black, green, blue, pink, and white. Easy to Use: Download the free iSearching APP and pair it with your smartphone. When you press the remote, the receiver will beep, allowing you to hear the smart tracker within 30-49 feet. Once the key tracker is connected to your mobile phone via Bluetooth, the lost device can act as a remote control button to operate your mobile phone's camera shutter, making it easy to capture beautiful moments. Ultra-Low Power Consumption: The built-in CR2032 button battery is replaceable. It's easy to carry as a keychain on your child's school bag or hang on a pet's collar. The real-time displayed location effectively prevents your children and pets from getting lost. It provides the last seen pin-drop on the map via the APP to help you recover your items and locate your car in the parking lot.