A portable power supply for controlling laboratory experiments, the power supply includes input terminals that receive control signals and power terminals that supply power to laboratory devices. A semiconductor optical device and an optical module including a package substrate and a semiconductor optical device mounted on the package substrate are provided, whereby there are realized the improvement of device properties and the long-term reliability through the use of an Al composition ratio-reduced tensile strained quantum well layer. The invention executes a series of logic steps on each signal including a voice activity detector step, frame comparison step, and sequential recording step. Associated with the convection conduit is a front panel incorporating therein audio speakers and two different light sources, one being a white light source and the other being a colored light source.