I bought and assembled two devices. Mechanically they make a good impression. Two solid connectors ensure the contact between the upper - and lower part. The units were both immediately used in the garden, where function right from the beginning. So far, they scare away the vole reliably together with a unit of a large construction market. The mentioned rainwater problems have not yet occurred. Sensitive ears hear the 400 Hz tone even in a few meters distance. Overall worth a buy recommendation.
