A docking station "universal" (my eye) that works a little too discreetly

Already on the box, it is well marked (in English) "Dock for Samsung Galaxy S3 - Compatible with Galaxy S2, Galaxy Note, Galaxy Note 2" for Universal so could use some work! Also, when I put my Galaxy Trend, it is clear that this is not completely done, the bottom of the smartphone is not flat, it wanders too anyhow.
In terms of operation, I plug my charger back, I put the phone on the station and ... nothing ... well ... I change and instead, I put the USB cord still nothing ... ... by cons, no worries, if I put both directly on the smartphone.

I therefore request an exchange at Amazon for a second try and the same, nothing happens! I still leaves the smartphone on its station, you never know ... 3 hours later, the battery is 100%!

THE CHARGING IS TOTALLY SILENTLY!

No icons, no graph, no title shows it is charging! Once out of its docking station (and no, not before) by consulting the battery charge chart, one might think that the reloading has been done by the holy spirit!

In short, a universal dock but not walking without anyone knowing!