Warning system, male voice, numerical countdown: Listen & Download Warning system, male voice, numerical .mp3 Error! Change your browser, please! ⇓ Download Open wooden box ⚠ Flag flaps in the wind on the seashore ⚠ Sine wave (975Hz) ⚠ Bicycle rear wheel ratchet ⚠ Bullet hit in metal ⚠ Ax strike on a wooden subject ⚠ Turn on, Daylight lamp, blink ⚠ The noise of the great hall ⚠ Ice crushing ⚠ Blowing into the microphone,, Knocking ⚠ Harvesting machine ⚠ Wooden whistle ⚠ ★★★★★