iPod Nano 3rd Gen device Cables are multifunctional and can do many things. They can connect one phone to another. They can also charge your phone if one end is a USB port, iPod Nano 3rd Gen device can be plugged into your computer. This will also enable you to connect your iPod Nano 3rd Gen device to your computer enabling syncing and other related features for data transfer. Some USB cables have a dock connector on one end and a USB termination on the other. Still other types of cables will connect your iPod Nano 3rd Gen device to an audio or video device or a combination of the two. These can be connected via dock connector or headphone jack.