Smart tracker for keys: Key Finder uses BT 4.0 technology to connect Android, iOS, iPad and other smart phones. Show lost car key, luggage, wallet, dogs, cats distance from you on APP to let you find them accurately. 5-pack smart tracker locator includes black, green, blue, pink and white. Easy to use: APP remote control Download free APP iSearching and then pair it with your smart phone. When you press the remote control, the receiver will "beep" and you can hear voices from the smart tracker within 30-49 ft. 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 photo shutter of the mobile phone, and it is easy to press and leave a beautiful moment. Ultra low power : The built-in CR2032 button battery is replaceable Finder Key Ring: Key Finder smart tracker is compact in size, lightweight and easy to carry as a key ring on your child's school bag or hang on the pet collar, the real-time display location effectively avoids your children, pets are lost. Provide a last seen pin-drop on the map via APP to help you recover your items and search for your car in the parking lot.