is a "walkie talkie" that works over cell phone towers. It has a button that you press to talk, and that's about it. It is so easy to use. Last year our 5 year-old ran free around the neighborhood because of this.
It has GPS, so tracking is super easy. At the time our 11 year-old went to a BYU football game with his buddy alone, because we knew we could track and talk.
I've used my phone to talk to the kids while I was in northern Utah and they were with friends in Southern Utah.
$10 a month isn't that bad at all. We have 4 of them and, when we have normal non-virus situations, each kid runs off to play and knows they need to grab a relay.
Check it out. You 80s kids will love the freedom it will give your kids.