Cries of a little bat found on the ground :'( Bats use ultrasound to move and hunt, but they also shout in some cases. UCS Category: ANMLBat. Duration: 00:13.
Telephone tone when the phone rings, in the UK, Ireland, New Zealand and many other countries with historical ties to the Commonwealth. These are two sound waves of frequencies 400 Hz and 450 Hz sinusoidal. This sound is easy to loop. UCS Category: COMTelph. Duration: 00:30.
Telephone tone when searching a correspondent. This is a sound wave frequency of 440 Hz sinusoidal. This sound is easy to loop. UCS Category: COMTelph. Duration: 00:01.