IPod game steps towards entering the video game handheld console market. Even video game magazines like GamePro and EGM have reviewed and rated most of their games. The games are in the form of .ipg files (iPod game), which are actually .zip archives in disguise. When unzipped, they reveal executable files along with common audio and image files, leading to the possibility of third-party games. Currently, Apple has no publicly available software development kit (SDK) for iPod-specific development. The iOS SDK covers only iOS on the iPhone and iPod Touch, not traditional iPods. As of October 2011, Apple has removed all the
IPhone placement of the microphone and speaker on the base on the unit—the speaker is on the right. Volume controls are located on the left side of all iPhone models and as a slider in the iPod application. The 3.5mm TRRS connector for the headphones is located on the top left corner of the device for the first five generations (original through 4S), after which time it was moved to the bottom left corner. The headphone socket on the first-generation iPhone is recessed into the casing, making it incompatible with most headsets without the use of an adapter. Subsequent generations eliminated