1. A device comprising: a device body comprising: a touch-sensitive display; and a processor; a band coupled to the device body; a first optical sensor in or on the band, wherein the first optical sensor faces outward from the band and is configured to capture an image and the processor is configured to communicate with the first optical sensor to process the captured image; and a second optical sensor in or on the device body, a center of an angle of view of the second optical sensor being substantially parallel to a viewing cone of the touch-sensitive display.