You can consider an Apple Watch Series 4 or later with Cellular connectivity. Apple Watch Series 4 and later feature build-in fall detection mode that can also alert the emergency services and customizable emergency contacts. A cellular variant remains connected to the Internet even if the paired iPhone is not in the proximity.

You can refer to the Apple Support document, [Use fall detection with Apple Watch](https://support.apple.com/kb/HT208944) to learn more.