Take a look at the reviews on Amazon --

https://www.amazon.com/GEKO-Emergency-Au...customerReviews

It requires a lot of stuff for it to work -- a social media account, an Android phone, an app that's constantly open, a subscription, etc. Some people find it useful for their elderly relatives in "I've fallen and I can't get up" sort of situation, but with so many requirements, I am not sure I'd rely on this gadget.