I am surprised to see that this oven still exists. I have had it since 2011. It works flawlessly and daily for at least 2-5 times a day for the past 8 years. Indeed, as some others have mentioned, the beep beep after the heating is annoying and unnecessary. Someone may want to warm something up and go to take it out of the oven after 5-10 minutes. If they don't do it and it is in another room of the house, they will have to listen to that annoying beep beep. This has no particular substance or obvious reason for its existence. It does not provide any safety, meaning that if you don't go to close it, it won't explode, for example. Lol. Other than that, it is very good and at a very good price, and in my case, it has proven to be of good quality since it operates as if I bought it yesterday.