Unfortunately,PERS services are designed to work exclusively from home. When the PERS emergency button is pushed, the console automatically connects with the response center via the home telephone.
yet, these devices don't work over wireless systems like cell phones. The advantage to this is that the service center instantly knows where the call is coming from -- your dad's address would pop up on the center's computer, as it would on a 911 system.
When your dad is out and about, there are a couple of alternatives to help him in an emergency. First, he should carry a cell phone, so he can call for help if he's able. (A cell phone won't pinpoint his location, however.)
Another helpful option is a MedicAlert bracelet personalized with a unique phone number. If your dad needs emergency assistance, the responders (paramedics, police, fire fighters) can call the number on his bracelet and immediately get detailed information about him, including his medical history, home address, and family contacts.
The nonprofit MedicAlert system works whether your father is at home or out of town. (It even works in many different countries.) However, it still depends on someone else to tell dispatchers where your dad is located if he can't do so himself. You can contact MedicAlert online or at 888-633-4298.