Trying to figure out what the middle button on this switch does - this is at work, so I can't pull out the switch to look up a model number, and none of the pictures seem to match.
Top button turns it on, bottom turns it off, and the middle up/down control the dimming - but the little circle button adjusts things, too, and I'm not sure if it's some sort of preset (and if it is, how to use it).