A battery is mounted to a front part of a wheel housedamper housing, and a relay box as automotive equipment is mounted to the rear of the battery via front and rear stays in such a manner as to be separated upwardly. The slider and suspension assembly comprises a slider, a suspension, and composite fiber solder. The heat-dissipating apparatus includes: a chassis engaging the heat-generating source and having a fluid passageway allowing fluid flow therethrough; a radiator for further heat dissipation; a pump; sensors to measure temperature of the chassis and the wellbore; and a compensator to regulate the pressure of fluid in the passageway. The second transducer ring includes a plurality of receivers for receiving the wave. The HVAC system is run to maintain an energy saving setpoint temperature. The light emitting sets are disposed on the convex surface portion and are coupled electrically to the circuit board unit.