A primary carpet backing that is tuftable with carpet face yarn has a self-bonded or spunbonded or needlepunched nonwoven adhesive fabric needled or thermally bonded to a supporting fabric. The user can designate particular \u201ccontacts\u201d listed in a database as being authorized to send high priority communications to the device. The optical sensor includes an array of photodetectors disposed on a die having a surface substantially perpendicular to the illumination direction.