Laboratory experiment: Listen & Download Laboratory experiment .mp3 Error! Change your browser, please! ⇓ Download Police whistle ⚠ Hum, High-frequency squeak ⚠ Umbrella pulling telescopic tube ⚠ Energy shot ⚠ Squatting the Mat (1.5 seconds) ⚠ The noise of the refrigerator room ⚠ Airport Luggage Transport Belt ⚠ Umbrella opening ⚠ Ironed ⚠ Pounding in the mud ⚠ The robot makes sounds ⚠ Noise inside the spaceport ⚠ ★★★★★