Flora: function of the little switch

[tslg]

Hey there, I'm kind of new to electronics and just got my new flora board.
It works fine but I couldn't find some infos about that little switch and its function.

http://i.imgur.com/DfkW7uU.png

I looked it up in the scematics but I don't know what it will do, it is labeled as "ON/OFF EG1390" (again I'm new to electronics).
I know the little button is "RESET" for the ATMEGA, but switching the position of the switch does nothing at all.

Thanks for your help and time.

[adafruit_support_bill]

The two-position switch on the Flora is an on/off switch.

[benhhumphrey]

It's only effective if you're running off of battery power; if you're getting your power through USB, it doesn't do anything.