As the name says it is a teapot designed for two people. So if one person prefers green and the other prefers red tea then you can prepare both of them inside the teapot . The teapot is divided on a half so it is possible to pour the tea from one or the other side. You can easily hold the lid while you are pouring . Thanks to that you avoid spilling out the tea.
It looks like an interesting concept, but I do have some concerns about the design. Basing on the image, it seems every time when you try to pour the tea, your finger is all over the hole of the spout. [source]