It should be the K70. You can tell by looking at the face material and the volume adjustment wheel. The design is obviously different from the K68.

The K70 series was launched in 2013 and has continued since then, so there are many models. The common ones are K70 (first generation), K70LUX (improved version), and K70MK.2 (official second generation). ), K70MK.2 Smart (the second-generation short keycap version), and there are also some other relatively rare versions.