Whelens in "Indoor Protection" tone.

[Corey Hudson]

Means: House with all windows closed or any nearby building with minimal windows, so that gas or harmful airborne contaminant cannot enter.

Sounds: Backwards wail with warble.

Link: http://www.safetycom.com/index3.html#

[Joey P 3]

I love the indoor protection it's such a cool tone

[sirenman1bd]

Spooky

[thunderbolt69]

Sounds really spooky

[ver tum]

Thanks guies for explaining what these tones mean. As far as I know, these tones aren't used on any of the Whelens around here, and all of our Whelens are privately owned chemical release sirens.

[kswx29]

If anyone lives in or near McKinney, Texas that is where the sirens are.

[Fletch]

Love the tone, as it really gets your attention. Electronic sirens can do some pretty cool tones. I know a lot of people here prefer mechanical but I tend to be a fan of the electronic variety.

Now, if only Whelen made dual tone electronic sirens, then I would be in heaven.

They should call this particular tone the "alien invasion" tone. LOL.

[Daniel]

"All clear" and "audible alert" are the same sound. Many of the tones such as "indoor protection" have a tremolo effect. In recent years, many European hi-lo police sirens have added this tremolo. Is this supposed to cut better through ambient noise?

[jkvernon]

Here's a video of a 2805 in Denmark doing the Indoor Protection tone.

[thunderbolt69]

Here's a video of a 2805 in Denmark doing the Indoor Protection tone.

Where's the video?