External magnetically actuated valve for an artificial intraurethral urinary sphincter. A portion of the reflective member is disposed over the light source. The board model then inputs to a package model. During a receiver mode, the impedance matching network is disconnected from the transmitter portion so that the impedance matching network remains connected only to the receiver portion, and signal-to-noise ratio in received NMR signals is maximized. The graphical user interface scroll control can enable a user to adjust the portion of the content displayed in the panel area in a first direction by manipulating the graphical user interface scroll control in the first direction.