The user manual is obviously translated by Chinese translators, it is incomprehensible and meaningless. In other words, you don't understand anything. There is a red light that flashes and its existence is not explained. User instructions in English are necessary, not Chinese-English.

Bad listing. The phone does not have two lines, it simply supports adding another device on the same line.

The main negative aspect is the lack of user instructions. Desperately in English, without at least a photographic guide.