Maemo.Org community member HtheB has found a little trick (or usefull bug?) where you can turn your Nokia N900 into a Megaphone.
The things you need are:
You can safely unplug the headphones and still be able to use it as a megaphone. Or plug in some very loud speakers on the N900
You can also transmit the sound trough FM Transmitter!
after you unplug the headphones, you can just simply enable the FM Transmitter.
To close the "Megaphone", just simply close C FM Radio.
To join the discussion, please follow this Thread