The complaint claims patent infringement on the Apple iPod classic and Nano, the Microsoft Zune, and a plethora of other devices including the LG Chocolate VX8500.
According to the Register, it seems Tsera does not have a strong case. More in depth, the patents describe the touchpads as those that can "interpret commands made by detecting the patterns of strokes made by a user upon it, with each of several patterns corresponding to a predefined function or command of the device." Additionally, the patents say: "No immediate visual feedback is provided as a command pattern is traced, and the user does not need to view the device to enter commands." None of that sounds like Zunes, or iPods.
From all the defendants, Apple has the most to lose, as Tsera says the company deliberately disregarded the patents, knowing of them as early as 2004. In the suit, they seek "enhanced damages, up to treble damages" from Apple, while only asking the others for standard damages and "compulsory future royalty" payments.