A product worth avoiding

The first disc is defective, I returned to the vendor who, at my insistence, I traded him and even sent me a small gift in addition to apologize (good point for the seller). Alas, the second product does not work either !!! First, the disk is not flat, only the center is in contact with the induction plate, there is an interval of one to two mm around the entire periphery of the disc including pan when filled with 3 liters Water is put on it. Then, following the initialization procedure cited in the manual, we find that the disc accepts 10 minutes heated to 500 watts (low heat), but during the second heating 10 mins at 1000 Watts ( medium heat), it places the error induction hob. Then useless to try to make him undergo a full heated to 1,500 or 2,000 watts. Obviously, this low-end product is unusable. Its price is deceptively attractive, because the shipping and return the product to exceed the price of the product itself. It is a product to sell, to buy, to sell, to buy, as in the story of the shirts in a round of the Sentier district ... :-)
Unfortunately this is not a product for using your classic pans safely worse, unattended, this may leave your plates.
Flee, or buy something more expensive but really effective. The thinness of the plate should have alerted me (5 mm smaller barely, when the bottom of my pots exceeds the cm).