From How the Larklife Wristband Could Turn Us All Into Quantified-Selfers:

The Larklife wristand communicates via low-power Bluetooth with an iPhone; a custom app delivers behavior-change hints.
The Larklife wristand communicates via low-power Bluetooth with an iPhone; a custom app delivers behavior-change hints.

The Larklife wristand communicates via low-power Bluetooth with an iPhone; a custom app delivers behavior-change hints.