One post surgery must-have that I definitely recommend is a set of walkie talkies. They definitely came in handy between the caregiver and me. It was much easier to use than a cell phone and required a lot less effort. I carried the walkie talkie with me throughout the house. Having it near my bedside when I was napping or sleeping made me feel comfortable that I was always able to contact my caregiver if I needed anything.
(I do not have a medical background, this post was written based on my personal experience.)