Hotel Management has an article mentioning how hotel panic button solutions are being used by Curator Hotel & Resort Collection.
Employees wear a cellular wireless panic button that can be pressed when help is needed. Bluetooth beacons are placed around the hotel that allow the worker to be located.
There are other ways to implement such systems without needing expensive, extra, cellular wireless. For example, it’s possible to piggy back on phones employees are already carrying, use beacons with 2-way radio or have gateways around the hotel to detect location.