Surface Call Points...

[Nli.]

Rightttt, I have a question. You know in schools and work places you have these "triggers" to sound the alarm (below).

http://www.tlc-direct.co.uk/Images/Products/size_2/ESFHD1.JPG

I know what that is for, but im wondering what the green one is for? It's like this one http://tbn1.google.com/images?q=tbn:br9lcnlXO-xIdM:http://www.comertia.com/img/miniatura.php%3Fimage%3D7998 (http://images.google.co.uk/imgres?imgurl=http://www.comertia.com/img/miniatura.php%3Fimage%3D7998&imgrefurl=http://www.comertia.es/ofertaproductos/empresa_95422.phtml&usg=__wPhIhISPCwY7HBIMaxV38bReFi8=&h=106&w=110&sz=4&hl=en&start=10&um=1&tbnid=br9lcnlXO-xIdM:&tbnh=82&tbnw=85&prev=/images%3Fq%3Dgreen%2Bsurface%2Bcall%2Bpoint%26um%3 D1%26hl%3Den%26safe%3Doff%26sa%3DN) without the Fire writing.

[LoveToStack]

It's the same functon exactly, just you can buy them in different colors. You do get different ones though, flood ones for example. But they SAY 'flood' on them. :)
Contrary to popular belief, the green ones are not gunge-related.

[ToxicPaddy]

The green ones are usually emergency door release, aren't they? Like if there's a fire and the door is on a magnet lock press it to get out.