Sorry, I did not want to add a lot of blurb to keep it concise for my question.
This is a personal locator beacon, a hand held unit the size of a flip phone. Usually used on land. In my case for solo wilderness hunting, deep woods mountain biking, upland hunting in snake country. It is a last ditch lifeline, only to be used if you are in grave danger and / or can't get yourself out. Generally people use it if they have accidents, medical emergencies etc.
This unit has 3 batteries in the pack for a total of 9+ volts and it is the majority of the bulk and weight.
https://www.acrartex.com/
Thanks!
G