A depletion mode field effect transistor is monolithically integrated with an enhancement mode FET in a multi-layer structure. The mounting assembly includes a mounting surface with a mounting frame, the mounting surface is contiguous with a generally parallel upper and lower surfaces. The transmitter transmits a signal relating to a parameter measured by the sensor. Additional example features of the invention relate to the drawable cartridge structure, the roller unit, andor the recording medium accommodating cartridge, e.