Bought a 110VAC electronic device from Amazon for about $40. Makes a chirping noise that is suppose to keep the mice and birds away. Three levels of volume, quiet (I couldn't hear it even with my hearing aids in), medium, (can hear it inside as well as outside when right up against the trailer) and loud (you can hear it 15-20 feet away from the trailer). So far since I put it in the only mouse I caught was in the basement storage and it had been electrocuted by the peanut butter baited mouse zapper.