Apple iPod shuffle 4th Generation pinouts
The connector/pinout information may be applied to the Apple model iPod shuffle 4th Generation
iPod Nano (4th, 5th Gen), iPhone (1st, 2nd, 3rd, 4th Gen), iPod Shuffle (3rd Gen), Cell Phone Connection pinout iPhone headphone (handsfree)
Universal Apple-compatible CTIA Headset/Earphone 3.5mm Jack (LRGM) pinout for Samsung, HTC Hero, Blackberry and other cell phones with 3.5mm, 4 connection (4 "pin"), headset jack.