4-Pack Mini GPS Tracker for Dogs, Round Portable Bluetooth Smart Anti-Lost Device ANTI-LOST KEY FINDER: This smart key tracker is a great gadget to alert you when you're about to forget your belongings. Pair with the app and keep it running in the background; your phone and key finder will both ring to alert you when disconnected, perfect for travel to avoid loss. PORTABLE & CONVENIENT: The smart key finder is designed in a compact size and is easy to carry around. You can put it in your wallet as a wallet finder or in your bag with your phone as a phone finder or any other item finder, providing convenience wherever and whenever you are. LONG BATTERY LIFE & STYLISH: The Bluetooth key tracker is powered by a CR2032 battery with super long standby time over 10 months and is easily replaceable for long-lasting use. Delicate and elegant appearance makes it look like a piece of art. FIND YOUR THINGS: The key finder is a great gadget to help you search and find things you've always lost. Simply attach it to your luggage, wallet, keychain, or pet. If you can't find your belongings, double-click the button in the app and your phone will beep to help you find things quickly and easily. COMPATIBILITY: You can check the map location when you disconnect the anti-lost device on your phone; supports iOS system and Android 4.3 or higher (requires Bluetooth 4.0). You can scan the QR code included in the manual to download the software.