To provide a laser driving apparatus which is inexpensive and has high reliability in spite of using a plurality of light sources, since a multi-wavelength light source is required for treating different kinds of optical disks such as CD, DVD or the like. One method is the application of post-polymerization process steps to advance the curing reaction and to thus obtain a more densely crosslinked polymer network. Importantly, these compounds can be administered orally. A semiconductor substrate, lead frame, and lead frame are accommodated in a package in the magnetic sensor. The bailer can be used in conjunction with other components in a downhole pumping system, a surface pumping system or a transport system. Connecting the first connector to the first wire pair and connecting the second connector to the second wire pair activates the communication service on the second wire pair.