A street lamp system includes an illumination device, a display unit and a control module. The common inlet valve consists of a common inflow tube, which connects via tubing to the catheter where bodily fluids will enter the selective capacity chamber. A user desiring to change the design on the ornament system can easily interchange an existing ornament member with a new ornament member without damaging the wearable item and, if desired, without having to remove the garment or other wearable item. Thus the overall signal-to-noise ratio is improved, resulting in a greater probability of correctly determining the stored data.