First, make sure that you qualify for it.
You want to be sure that the design of your product, is in fact, unique. As other answers have indicated, the features (not the use) of the product is what is protected under this type of patent.
Next, you need to be sure that you fill out the proper paperwork. A clear drawing is a standard part of the application. It showcases what makes the product unique and also addresses the limitations as well.
Keep in mind that the design patent can be useful so that your product remains unique, even if the market is saturated with similar products. However, it will not protect the idea or invention aspect of it. If you are looking for that, then you will need to file a utility patent.
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