It depends on whether it is a wheelchair accessible room or just a room with a hearing impaired kit installed.
The non- wheelchair accessible rooms with hearing accessibility are the same as other rooms, just with visual door knock and phone alerts, phone amplifiers, bed shaker notification, and a strobe light smoke detector.
We need a fully wheelchair accessible room with a roll in shower. Those have walk in/roll in showers and sinks that a wheelchair user can roll up to and under the sink to use. We have stayed multiple times in roll in shower rooms with hearing accessibility. Those rooms had door bells with a loud bell that also flashed lights and strobe light smoke detectors (which also had a loud sound).
The phone was set up for amplification, but we haven’a received phone calls, so I don’t know if it flashed the phone itself or lights in the room.
Bed shaker notification and TTY telephones are not installed unless needed.