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* 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* [http://www.youtube.com/channel/UCcA8w_6l3aSsRON_arLkVlA spaceman234100]* [http://www.youtube.com/channel/UCcA8w_6l3aSsRON_arLkVlA spaceman234100] - ''all credit to Linden Hudson''