Tattle Tale Sonic Pet Training Alarm - 2pack Sound level: 65 dba. @ 1 m. (re. 2 x 10 -4mb) Frequency: 5.5 khz Has a hanger hole to hang on doorknobs or curtain rods This pet repellent is a pet training device that helps to keep pets off furniture and counters Detects movement vibrations a loud tone sounds to startle the pet or the human Uses structural vibration technology for pet training