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A convenient, nature friendly method of keeping animals away from where you don’t want them .. Around 4 watts of screaming high frequency audio. Inaudible to humans, but a terror to animals. .. 3 settings for different levels of coverage .. Built-in piezo high efficiency speaker .. External trigger input for use with motion sensors and other detectors. .. Operates on 9 to 15 volts DC or AC. .. LED indicator shows when unit is operating. .. Informative manual answers questions on theory, hookups