We use transistor radios at camp all the time. The radio on the fish rack prevents bear and raven troubles, and the batteries last a long time... two weeks 24/7 at least.
.............. A neighbor had a raccoon family move into a utility shed that was built onto the side of their house. She wanted them gone but not killed or harmed. I had her put a portable radio ( with fresh batteries) out there and leave it on non-stop. Took a day or so IIRC but I saw mama raccoon moving her babies one by one over to the nearby woods in broad daylight.
