4-Pack Mini Waterproof Portable Bluetooth GPS Tracker for Luggage/Kids/Pets/Cat/Dog This smart key tracker is a fantastic gadget that lets you know when you're about to forget your belongings. Pair it with the app and let it run in the background; your phone and key finder will ring to notify you when disconnected – perfect for travel to prevent loss. Portable: This key finder is small and lightweight; it even hangs on a school bag or necklace, barely noticeable. Long-lasting & Great Battery: The Bluetooth key tracker is powered by a CR2032 battery with a super-long standby time of over 10 months and is easily replaceable for long-term use. Delicate and elegant appearance that looks like a work of art. Easy & Quick Locating: Simply press the button and follow the audible signals to find your key, backpack, luggage, wallet, TV remote, glasses, dog collar, camera, or other items; you can find lost items very easily with smart tracking devices. Multi-function: Anti-lost alarm, GPS tracking, and can also be used as a remote shutter for self-timer, selfie remote.