One star because there is no zero! The grounding is not connected, it is only there for show on the outside! Internally, the phase and the neutral are connected by pressure contact, without being in separate compartments, which means that if you use the 10A 250V stated on the adapter, you will be in trouble; also, any motor that requires grounding will not work! I wonder how they sell such dangerous products. The plastic parts look of good quality, but if you measure with a multimeter you realize there is no grounding, and once you open it you wonder who thought of this. Probably all adapters that do not have screws connecting their plastic parts have the same internal problems