Now, here is something that is just this side of brilliant. It’s a dock adapter that fits in the cassette tape slot in your car, and holds your iPhone 4s, iPhone 4, and any iPod that has a 30-pin adapter (sorry iPhone 5 and 6 users), and charges it. Of course, it’s not just an iPhone holder, it actually allows you to play your iPhone or iPod audio through your car stereo via the cassette player.