Ordered from german reseller - a real china wonder:

Kit content as shipped to me. Note the color of the ear-pieces!!

Fully assembled receiver. This is real china at its worst! The direct conversion diode mixer is optimized for one diode !! Never seen that and would never guess it does work :) Well it does a bit.. and for some reason this diode has been choosen as Ge type? There is no real reason for Ge here, as this diode is used as discrete on-off switch and not as rectifier for the RF signal. The german translation from mandarin is also cool - this single Ge diode is described as "FM Detector" .. so that all the DIY and kids/ self learners know how to make a FM detector with one diode! Grrrrrrrrrrrr

There is one function this receiver for sure has, the "microphone effect" if you knock, you hear it loud and clear. Turning the frequency adjustment knob makes REAL BAD noise..

But you can hear something with this thing, and the direction sensitivity is present in both modes, min and max.

Close to wifi router there is lots of EMI noise, strange why this thing should only receive around 3.5mhz ?