Bluetooth 5 tracker card with built-in antenna can fit in your smartphone case, laptop, wallet or tablet cover for locating them easily Compatible with eufy Security App (for Android and iOS devices) and Apple Find My App Built-in non-replaceable battery provides up to three years of battery life Global tracking helps you find your lost belongings by following the sound Double tap to ring your smartphone even when the phone is on silent mode Finders of your lost item can connect with you by scanning the QR code IPX4 construction can withstand water splashes and rain