Smart Key Finder: This Key Finder utilizes BT 4.0 technology to connect with Android, iOS, iPad, and other smartphones. It displays the distance of lost car keys, luggage, wallets, dogs, or cats from you on the APP, allowing for precise location. This 5-pack smart tracker locator includes black, green, blue, pink, and white. Easy to Use: Simply download the free iSearching APP and pair it with your smartphone. When you press the remote control, the receiver will beep, allowing you to hear voices from the smart tracker within 30-49 feet. When the key tracker is connected to your mobile phone via Bluetooth, the lost device can also function as a remote button to control 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. Lightweight and portable, it can be easily attached as a keychain to your child's school bag or hung on a pet's collar. The real-time location display effectively prevents your children and pets from getting lost. It provides a last-seen pin-drop on the map via the APP to help you recover your items and locate your car in the parking lot.