It has a clean appearance, nothing shakes or jiggles, and both the metal casing and the plastic components are manufactured flawlessly. In the year 2022, there is a specific instruction. By the way, the Chinese characters in the instructions strongly advise you not to remove the compressor from the case. I attempted to do so, but it is firmly secured by rubber clips that also function as the legs of the case. Verified, it gives a good shake.