Amazing to me they'd bring a daily charger to market.
Tethered to the iPhone, tethered to an outlet. Competitor commercials forthcoming.
You can use it without the phone, it's a small computer after all. It plays music over bluetooth, run apps, collect data without the phone being present.
You can't use the communication functions without the phone (or another apple device, I'm pretty sure it will integrate with non phone devices too).