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Ultrasonic Dog Barking Deterrent

87 bytes added, 14:19, 25 June 2019
/* pulsing audio */
The following lines were added (+) and removed (-):
* amplified audio pulses above 20kHz* amplified sine wave audio pulses above 20kHz* piezoelectric tweeter capable of 120+ decibels or piezo siren up to 200 db
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