As was another reviewer I had to make the experience that the surface of the device on the right side already was the first thawing of frozen food with 800W power for a few minutes up and almost scalding hot. After about 8 to 9 minutes then the overheating protection has switched off the device completely. Although most buyers have made predominantly positive experience with the device, I find it worrying that sporadically appear faulty devices will be delivered in which only prevents the overheating protection worse. Here Sharp should urgently make improvements in the quality control. I any case lacked the confidence to replace the faulty microwave to a replacement device of the same type / manufacturer and I have instead on Amazon a - performed exchange for a device from another manufacturer - easy.