Just sorted this out the product I say I remember was the Pimoroni Presto. You can search for it on their web site, and get all the details as to how it works.
However, the reason I couldn't find it on the site is that it is not actually available yet, you can only pre order it. It says it should be ready to ship early July, but we are a bit past that by now, so maybe something is delaying the order. Maybe it is the Donald?