Less than 12 kHz huh what... dang kids
14.1 kHz
14.9 kHz
15.8 kHz
16.7 kHz
17.7 kHz
18.8 kHz
19.9 kHz
21.1 kHz
22.4 kHz (and screams from the depths of hell)
Go to http://www.ultrasonic-ringtones.com/ and click on them little play buttons.
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