Apple Watch Series 4

To assist with:

Detects dangerous heart rate/rhythm, detects falls, and issues SOS.

How it works:

The fourth-generation of the Apple Watch (Series 4; from $399) includes all the features found in its predecessor — such as support for Siri, Apple’s voice-activated personal assistant and a waterproof exercise companion, But for the first time, there’s an integrated ECG (electrocardiogram) to detect a dangerously high or low heart rate, or irregular heart rhythm.

The updated watch also detects falls, and its Emergency SOS feature means it can call 911, notify your emergency contacts, send your current location (via GPS) and display your medical ID info on its screen for emergency responders.

Purchasing information:
$399 and up from Apple.