http://www.homedepot.com/p/Victor-Heavy-Duty-Pest-Chaser-Ultra-Sonic-Rodent-Repellent-M792/202072075?cm_mmc=Shopping%7cTHD%7cG%7c0%7cG-BASE-PLA-D28O-OutdoorGarden%7c&gclid=EAIaIQobChMI_ZjRxOmJ1gIVhLfACh2JZg0SEAQYASABEgIIvvD_BwE&gclsrc=aw.ds&dclid=CJOs6-XpidYCFVaAaQodnTAEKg
You won't hear the sound.