A semiconductor device structure is provided which includes a first field effect transistor having a first channel region, a first source region, a first drain region and a first gate conductor overlying the first channel region. The representative power tool may comprise a tool bit case, a tool bit, a drive motor and a cooling air guiding member. A diverter valve is coupled with the accumulator and being movable between a closed position to close the accumulator outlet and an open position to open the accumulator outlet.