I have a bird monitor that I haven't used in a few years. I've always loved feeding wild birds and I loved to listen to them when there's 6 foot of snow outside. I was thinking of putting this out with my girls so I could listen to them. The monitor usually goes off at dusk automatically, but was wondering if instead of putting this on "auto", should I put in on the "on" position to listen at night. Not use if this would work, but not sure how long the batteries would last. Anyone else use one of these?