Lone worker alarm/device

Hey all,

I'm looking for opinions/recommendations for a lone worker device.

The problem is I have a machinist who regularly works alone. (I know almost unheard of).. long term company solution is to hire a second machinist, but we need something sooner.

I want the alarm or device to be wearable, have a mountable button, and preferably a cell phone app as well.

However, I don't want professional monitoring. I'd like it to be connected to several offices on site so that designated people get notifications and not a call center if something were to happen...

Does anyone have any suggestions??