Customize the liberty to be your own travel system using favorite brands such as Chicco, Graco, and Peg Perego infant car seats * iBaby sound system which lets you hook up your iPod or mp3 player for music on the move * With a simple click you can change the front wheel from swivel to locked * Rugged 12-inch inflatable tires grip all types of terrain and provide a smooth ride * Easy swivel front wheel locks for uneven surfaces and turns easily in tight spaces