Photo printing just got faster and easier. Instead of waiting until you get home, you can use Polaroid’s pocket-sized PoGo to print on the spot. Using Zink’s "zero-ink" technology—paper that contains layers of heat-activated color dye crystals a few microns thick—PoGo eliminates the clunky ink cartridges of traditional printers. The device—weighing just eight ounces and measuring 4.7 by 2.8 by 0.9 inches—goes on sale July 6 for $150.