A Garmin watch is probably your best bet outside of one of those life alert type or similar devices. There’s a “kids” one with LTE and texting that might work w

A Garmin watch is probably your best bet outside of one of those life alert type or similar devices. There’s a “kids” one with LTE and texting that might work well too. I think the subscription is $5/m. They have a more advanced LTE+GPS watch as well but it’s more expensive. You can have them share their heart rate and other data, and the battery life is amazing. Edit: they have emergency support and location sharing too.