It's been a long time since I had a baby monitor. And let me tell you they have come a long, long way! This particular model is used by a family I know. They are currently taking care of their aging bed bound mother who lives in her own home in between her two children.
While most of the time there is someone with this lady (either family or hired help), there are brief periods of time that they use the baby monitor to listen to her sleeping.
And let me tell you, this monitor's sound is crisp at the distance of about 1/2 of a football field away. The monitor's receiver comes with a belt clip and has the option of operating on batteries in case you want to sit outside or garden. Another great feature is that the monitor has a light that will tell you when you are out of range...really nice that you don't have to just guess that it is working :0)
And best of all the unit sells for under $50! An excellent investment that I have recommended to many other families in similiar circumstances.