Product Description Smart Tracker for Keys: Key Finder uses BT 4.0 technology to connect to Android, iOS, iPad, and other smart phones. Display the distance of your lost car key, luggage, wallet, dogs, cats from you on the APP so you can find them accurately. The 5-pack smart tracker locator includes black, green, blue, pink, and white. Easy to Use: APP remote control. Download the free APP 'iSearching' and then pair it with your smartphone. When you press the remote control, the receiver will emit a 'pip' sound. You can hear voices from the smart tracker within 30-49 feet. When the key tracker is connected to the mobile phone via Bluetooth, the lost device can be used as a remote control button to control the mobile phone's photo shutter, and it's easy to press, capturing a beautiful moment. Ultra-Low Power Consumption: The built-in CR2032 button battery is replaceable. It's lightweight and 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. Provides a 'last seen' pin-drop on the map via the APP to help you recover your items and find your car in the parking lot.