It was originally $300 in the US.
From what I can gather, it has a solenoid in it, that presses on the Mags On/Off pin or the sear pin, thereby converting a mech Mag, into an Electro.
From what I can tell, on/off pin length is critical...as is having the marker gassed up, for the solenoid to activate.
Do a search on Automags.org as they seem to know about them, on there.