In their teardown of the iPod touch version 2, iFixit found a secret surprise: A Broadcom Bluetooth chipset! Though totally unannounced and not listed on the spec page (Apple says Nike+ doesn't use Bluetooth), the iPod touch's Bluetooth chipset supports 2.1+EDR. We don't know for sure yet if it has A2DP, which would let you use stereo headphones—and be another hardware one-up over the iPhone besides ">the built-in Nike+ functions. We've got our fingers crossed—what else would it be used for? Update: MacRumors notes that Nike+ uses the same 2.4GHz frequency as Bluetooth, so that might be what's going on here. [iFixit]
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I wish there was a microphone too. This device, now that it also has a speaker, could make a good VoIP device.