Hi,
We just found something that is working for our communication - so far - it's a wireless doorbell! It was the cheapest one available at Home Depot. The push button that came with it is a little difficult for my husband to push, so we will probably have to replace it with another one that I found that presses easily. We had to buy a separate push button anyway in order to make it available in two locations. The doorbell itself is about 4" x 6" x3", and is easily taken from one room to another. The "front door" rings a ding-dong and is mounted beside the bed. The "back door" has a single ding (or dong, if you prefer), and is near his computer.
It's been working out just fine. Simple and usable as well! Plus, it is loud enough to wake you up.
Hope this helps!
Lynn