They’re basically a 2×6-inch micro-fibre cloth sewn inside a mini neoprene pouch, which clips onto your mobile phone, digital camera, PSP or whatever. When it needs a wipe, pull out the cloth, before stuffing it back in the bag when you’re done.
Alpine doesn’t sell them direct, mind. It manufactures them for companies with customised designs. But I thought they were pretty cool. If you fancy a few, you can order them in runs of 30, 150, 250, 500, 1,000 or 2,500.