the latest iPod nano hasnt Bluetooth. You can buy a Bluetooth Earphones pack with earphones and a Bluetooth transmitter.
i10s Bluetooth adapter ($45) - Since the iPod nano 6G doesn’t have Bluetooth, a dongle is your only option. While dozens of choices exist, the i10s BT adapter is the smallest of the lot. When you’re rocking the world’s smallest iPod, you don’t want a big horsey adapter jutting out of the side. At about two-thirds the size of Sony’s BT adapter, the i10s is the perfect fit. The i10s is zero-config and auto-pairs when it’s powered up.