Smart Key Tracker: The 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 the APP for you to find them accurately. 5-pack smart tracker includes black, green, blue, pink and white. Easy to use: APP remote control Download free APP iSearching and 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 9-15 meters. 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 is easy to press and leave a beautiful moment. Ultra-low power: The built-in CR2032 button battery is replaceable Key ring for finder: The key finder's smart tracker is compact in size, light and easy to carry as a key ring on your child's school bag or hang on the pet's collar, the real-time location effectively prevents your children, pets from getting lost. Provide a last seen pin on the map via APP to help you retrieve your items and search for your car in the parking lot.