The Swissdigital Finder Keychain works with Apple Find My network.\r\n\r\nThe device plays an audible alarm with a maximum volume of 110 dB to help you find your missing items quickly and easily.\r\n\r\nThe Finder Key Chain has one battery pre-installed battery and extra CR2032 batteries for future use.\r\n\r\nWhen the finder is far away from your iPhone, iPad, or other Apple devices, it will alarm continuously for ten seconds if anyone else but yourself moves it.