No product is compatible with such a thing, it is a scam

There is no cable of converting RCA / SCART HDMI.
CAN is an analog signal, the HDMI digital signal. We need a converter that converts the voltage RCA cable in small zeros and small one for the HDMI cable. And it asks the calculations, and thus a power outlet.

This is what the description trying to say in broken French: it is necessary that the machine that emits the image to make every single translation and uses the RCA cable to get a signal ... of zeros and ones.
Basically, except if manufacturers have a partnership with the odd Russian who sells the m ****, nobody is sufficiently stupid to do that.

If you want to send an image to zeros and some, you plan an HDMI output on your device and you do not put RCA output that will force your users to buy a converter: any TV pèterait cable if zeros and Some arrived by an RCA input. She expects a voltage, digital was invented after the CAR. This is common sense.

So basically: Look for a converter. A housing.