A controlling device is used to configure a target device for wireless network communications through use of a setup wizard. The invention provides certain liquid crystal material that can be employed in both bistable and analog device configurations. Thus, modest translations or rotations of the illumination source or changing the illumination source does not require recalibration of the instrument or prior modeling of illumination variability due to such changes. Versions of the arm retaining device elastically bias the end members against the corners of the person’s mouth in an adjustable manner, allow adjustment of the length or range of motion of the exercising device, retain the exercising device at a fixed length, or a combination thereof. The optically transparent wall is joined with the section of the lid component such that the optically transparent wall and the lid provide a seal for the active components of the optoelectronic device.