I played it again and again and again. I hear nothing at all when the white noise was played. That's the problem with the white noise alert.  Anyone with certain frequency dependent hearing loss, can't hear it. It is also rendered useless by any other source of white noise, such as water, wind or large volumes of motor traffic. The backup beep on the other hand is a clear 1kHz, which is clearly audible to all but the deadest of individuals from birth to well over 100 years old. It is also an unnatural sound that immediately calls attention to itself. White noise is easy to ignore since it occurs so often in nature.,(reply>), That's a youtube issue. The whole idea with the white noise is that everyone can hear it, unlike the beeps. But youtube doesn't convey it correctly. Its a recording of the noise after all, not the noise itself,(reply>), @Andrew Williams A lorry with pneumatic breaks reversing next to pneumatic contruction equipment?  All the time.,(reply>), @Thor tinnitus is usually around 1.4khz, annoying too,(reply>), cruiser james you’re lying,(reply>), @pmailkeey because the narrator of the video clearly talked about it hissing, jackass