Apple iPod 4th Generation (Photo) pinouts
Apple iPod, iPhone (2g, 3g), iPad Dock connector pinout Used in 3rd and later generation iPods for charging, connecting to a PC via USB or Firewire, to a stereo via line-out, to a serial device (controlled via the Apple Accessory Protocol). This connector exists in most Apple iPod MP3 players (iPod 3G, 4G, 5G Video, 5.5G Video, Nano (1G, 2G, 3G, 4G), Mini, Classic, Touch, Touch 2G, and iPhone (1G, 3G, 3GS, 4 and 4S))
Apple iPod, iTouch, iPad remote and headphone pinout The 3rd generation iPod introduced a new headphone and remote connector, which carries audio data and remote control data to the iPod. The remote control data is sent via a serial Apple Accessory Protocol.
Note, on the iphone, itouch, ipad devices, the base ring is used for microphone input.
Apple Inc. is an American multinational technology company that designs, develops, and sells consumer electronics, computer software, and online services. The company's hardware products include the iPhone smartphone, the iPad tablet computer, the Mac personal computer, the iPod portable media player, the Apple Watch smartwatch, and the Apple TV digital media player.