Help with microphone electronic brick module

I am having some trouble to use the microphone electronic brick in with a lilypad board powered via a 3.3v ftdi basic usb cable.

First, I tried to get some microphone signal using PWR, GND and a analog input from the lilypad board. It seems that is there is no connection, no signal, like an open circuit. Nothing changes if a change VR1(microphone board) position.

Also I tried to supply 5V directly to microphone board, using a 9v battery and 7805 regulator. Nothing changes.

some questions:
how to test this microphone board?
where is the datasheet of this brick?

Any ideas are welcome