I have a Motorola hubble camera. I bought it from curry's. It has an app to my mobile. I have it downstairs it works great picks up sound and great at night. My dogs were waking at night and I caught the culprit my cat tormenting them.
Using an app on my phone I can hear and see him and you can move the camera about. If you have multiple rooms you will need more than one but they are not expensive and mine is still going strong after 3+ years.