A weight-adjustable kettle-shaped dumbbell includes a body. The illustrative embodiment shows a block etched with a series of depressions to function as waveguides, light source holders, a material-containing channel, and fluid inputoverflow receptacles. The Miniature Projection Head of the present invention projects an image of the veins of a patient, which aids the practitioner in pinpointing a vein for an intravenous drip, blood test, and the like. The ground terminal is connected through the metal substrate and the conductive layer to the grounding solar cell. Therefore, the compounds of the present invention do not possess the gastrointestinal side effects associated with nonsteroidal antiinflammatory drugs.