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Here we have the comic book ad (courtesy Silver Surfer #3, 1968) for Digi Comp I - "The Electronic Computer Brain". Since this is a comic-book ad, we've come to expect the product will not be worth the $4.99 asking price... but let's explore further, shall we?
According to the ad it "tells fortunes" (Yes, I see buyer's remorse in your future!)
"Think of how amazed all your friends will be when you solve problems of missile countdown, satellite re-entry and missile checkout..." (That's two missiles in one sentence - should this thing be for sale to the general public?!)
In case you're wondering what the Digi Comp I really looked like, here it is.