Personal alarms

Hi, my husband, while reasonably independent, uses a frame to get around due to sec ere arthritis in his knees and spine. He is a high falls risk. I have bought him a mobile phone and set it up so that with one press of a button he can either call me, or emergency, but he refuses to carry it with him, rendering thus solution useless.
So we are looking at a personal alarm. He doesn't want a pendant as they "label" him. Obviously I don't want to but one of those given his reaction to the phone.
I've read that there are various watch versions, with GPS, wireless, button which will send out a message to various phone numbers, two way voice contact etc etc.
The price for the different brands varies widely. Could owls provide information on their experiences with different ones so that I can make an informed choice?