What is what series is my apple watch?

Okay, I need more information from you to determine which Apple Watch series you have. I don't have access to your devices or any information about them. You'll need to find that information on your watch or its packaging and provide it to me.

Once you tell me which series it is, I can provide information about it in Markdown format with the requested links.

For example, if you tell me you have an Apple Watch Series 7, I would respond with something like this:

The Apple Watch Series 7 features a larger display with thinner borders than previous models. It also offers faster charging and improved durability. Key features include the Always-On Retina display, blood oxygen monitoring, and ECG app.