Good facilities, but defeckt

I have come across while rummaging in this device.
The price was attractive, so ordered.
In less than a week, the inverter was there.
As soon as you connect it to the 12V power source to the device Benam strange.
It flashed sparks, in the manufacture of contact.
In turn everything seemed normal. The built-in voltmeter showed the current voltage of my battery.
After a couple of seconds sounded a warning beeper and where the unit is normally absorbed power is displayed in Watt, the message "Overload" came in beautiful red LED font.

Here, no 230 volt device was connected to the inverter.
What should because then overload the inverter?
It was ever conducted no power to the appliance outlet.
Again disconnected from the battery and reconnected. The same result again.
2 more attempts without success.

Therefore sent away and anstandlos get the money back.
The AEG Geät was actually great.
Even had a wired remote control with voltage and watt meter.

I then bought a different brand