What's the difference between z9 and z7?

Differences in screen size and function.

1, screen size: The Z9 is equipped with a large screen, which is convenient for users to view and operate the contents on the mobile phone watch, while the Z7 screen is small, which is suitable for users who like thinner and smaller devices.

2. Functional differences: Z9 has more applications, more powerful processing capacity and higher storage capacity, while Z7 pays more attention to basic communication functions, such as calling, texting and basic health tracking functions.