An apparatus, system, and method for determining the presence of a mobile device located in a predetermined detection zone within a vehicle are disclosed. The system is composed of a downhole docking station assembly and a detachable downhole tool assembly. The circuit operates in one of a low speed mode or a high speed mode. Also described is a semiconductor device that comprises a metal gate electrode that is formed on a dielectric layer, which is formed on a substrate. Furthermore, the sensor chip and the circuit chip are mechanically coupled through the plurality of dummy bumps.