Vibrating alarm clock (vibrates the pillow, not the whole bed).
When my hearing loss was only moderate, I really liked having
a telephone amplifier with me at all times (a small square device that fit over the ear-piece of a land-line phone. Younger readers will be excused if they have no idea that public phones were once commonly found in movie theaters, subway stations, hotel lobbies, and the like.
)
As my hearing got worse, I got an amplified phone at home; now, even that doesn't really work well for me. But it's good for less severe levels of hearing loss.
In my newest home, we have
flashing lights for the smoke alarm. It would be a good idea to have the same for a carbon monoxide detector too, but we don't have that.
FM connection on my hearing aids, and a small mic to be used at large events, such as a large luncheon, so I could hear the conversation at the lunch table more clearly.
What I've tried and didn't like: a wired loop around the living room to connect to the T-coil on my hearing aids, to hear the TV better. Technically it worked all right, but the sound quality on the T-coil was not as good as the regular setting, and it cut out all other noise (like my husband making a comment, or the dogs barking at the doorbell, that sort of thing), so on the whole I didn't use it much.