It can  be connected to  your Apple device with the dock cable and sync your phone and PC by the extension cable.
Features:

• 100% Brand New and High Quality
• Specially design for iPhone iPod
• Connect iPod iPhone and dock by Male/Female Extended Cable
• Easy to charge, high speed data transfer and sync
• Can not transfer audio or music
• Item color: White
• Item length: 100CM

Compatible with:

• iPhone 2G 3G 3GS
• iPod Nano
• iPod Classic
• iPod Touch