Hello @sallysue, I never considered a baby monitor. Did you purchase a baby monitor originally for a baby or to use it for communicating with your sister?
I think it is a great device to use for either. We just happened to have the walkie talkies available after driving out of state to pick up another vehicle. we purchased them so we could inform each other when we needed to make pit stops to stretch the legs, eat, or restroom stops. Worked out great then and now. We do have to press and hold a button to talk then release to receive talk.

Thanks For Responding