Square is today shrinking down its iconic credit card reader with a new design that's thinner and more accurate than the original. After teasing a pending announcement yesterday, Square has made the latest revision of its hugely popular card reader official. The new design is 45 percent thinner than the original, essentially matching the thickness of an iPhone 5S. Square says that it's also enhanced swiping accuracy on the new model — which required replacing a number of existing components with custom-designed parts. (Wired has an up-close look at the design process.) Square's reader is also now compatible with a wider array of smartphones and tablets thanks to improvements to the audio plug connection. Square's updated credit card reader is available now from the company's website and will be hitting over 30,000 retail stores "in the new year."