United States market: 250,000 electronic hobbyists, students, teachers, and the rapidly emerging "hacking audience" 300-plus illustrations Hackable products include answering machines, digital and film cameras, old electronic equipment such as cell phones, seasonal decorations, and more Six case studies are also included that discuss hacking major electronic equipment such as the VW Beetle, Sony PSP, Apple iPod, iRobot's Roomba, Robosapien, and lawn mowers
Not very useful of a book (and outdated now, in 2015.) Also, Dave Prochnow is not a very good writer, his hacking skills notwithstanding. He's all over the map, from preachy about DRM to sexist to brimming with bad puns.
Get yourself a subscription to MAKE Magazine rather than read this.