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Compact circuit is housed in a fully potted plastic enclosure and can be powered from any 12~15VDC power supply. When connected to a piezoelectric speaker, the device emits ultrasonic tones from 8KHz~40KHz, ideal for repelling insects, birds, rodents and other pests. Up to four piezo speakers may be connected to a single module. Top mounted 10 position rotary switch selects output frequency.