This is an academic paper that gives an overview of mobile health technologies to respond to opioid overdoses, including devices that automatically respond to an overdose with administration of naloxone and devices that monitor biometric data to identify an overdose.
Tas, B., Lawn, W., Traykova, E.V., Evans, R.A.S., Murvai, B., Walker, H., Strang, J. (2023). A scoping review of mHealth technologies for opioid overdose prevention, detection and response. Drug and Alcohol Review, 42(4), 748-764.