Apple iPod shuffle 2nd Generation pinouts
The connector/pinout information may be applied to the Apple model iPod shuffle 2nd Generation
iPod Nano (4th, 5th Gen), iPhone (1st, 2nd, 3rd, 4th Gen), iPod Shuffle (3rd Gen), Cell Phone Connection pinout iPhone headphone (handsfree)
Apple iPod Shuffle (2G) USB interface pinout
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.