A transmitter includes a coupler to measure output power. Balls K1 being held radially fixed in a groove on the head with a depth N1 by a locking ring in the connected state. After the image is applied to the substrate, the image then appears in proportion and conforms to the (topography of the substrate. The print assembly includes a chassis that is mounted on the support structure to span the printing zone. The power savings functionality enables the device to have a battery operating life between charges of many hours of operation, such as eight hours or more, while the display functionality enables users to access, display, and interact with content in ways users have become accustomed and in ways not before possible. A Link Database stores links between source URLs and destination URLs.