The small square iPod.... with 3rd party wrist-straps available. It wouldn't have been too hard for Apple to have added Bluetooth and made a vaguely functional 'smartwatch', but the result wouldn't be great.
The small square iPod.... with 3rd party wrist-straps available. It wouldn't have been too hard for Apple to have added Bluetooth and made a vaguely functional 'smartwatch', but the result wouldn't be great.