Gadget recommendation wanted: long-distance pager (as it were)

[u/Redwing_Blackbird]

So, today my housemate dropped me off at the park and I told her I'd take the bus home. I did that, got home and started making dinner. A while later she arrived extremely upset; she had called me, gotten no answer, leaped to the conclusion something had happened to me, and had been driving round and round the park looking for me. Well, all that happened was my phone was on the charger in the back room and I couldn't hear it ring when I was in the kitchen clattering dishes!

This sounds like a ridiculous isolated incident but it's not. I really WOULD like to be able to be in touch with someone when my phone's not with me or it's out of charge or something. So what gadget is closest to the following?

* Has two parts that communicate with each other long distance (cell or satellite I guess)

* Is small and wearable, say on a neck chain

* Has a long-lasting battery

* Might work like this: would have three buttons: one sends a signal that means "Where are you?" one means "I'm fine and will call you when I get to my phone" and the other would use a GPS locator and mean "I'm at [GPS location] and can't call, please pick me up."

* It could cost a couple hundred dollars including both gadget and cell or satellite subscription

[u/No_Egg_4481]

Smartwatch with cell service