How Much Background Should a Product Page Include Before It Overwhelms Buyers?

I’m revising a product page for an item that needs a little explanation before its benefits make sense. The current draft covers what it does, who it suits, and a few common questions, but it’s starting to feel more like a guide than a page for choosing a product.

How do you decide which details belong on the product page and which should live in a separate article? I’m especially interested in what helps buyers make a decision without burying the price, key features, or next step.