Works with Apple Find My: Just use the pre-installed Find My app and add SmartTrack Link to the items tab. You can then locate it anywhere in the world using Apple's network of millions of devices. Find Your Phone in Silent Mode: Avoid tearing up your apartment searching for your phone. With just a double tap, your phone rings—even in silent mode. Free Left-Behind Alerts: Avoid losing your belongings in the first place with instant left-behind alerts via the eufy Security app—with no added fee. Always Linked to Your Item: If something's lost, you're always connected via Link's QR code. A person who finds your item can scan and see only the contact information you share. Share with Friends and Family: With the eufy Security app you can let others know the location of your items too. You Can't Miss the Alarm: Link sounds an alarm so loud, you can hear it if it's covered or in the next room. Water Resistant with a Replaceable CR2032 Battery: Link is safe—even if it's left in the rain—with its water-resistant coating. And it comes with a replaceable battery that lasts up to a year.