Protrusions 140 and 150 that inwardly extend from side walls of the housing 130 provide a form of a mounting guide for the circuit board 120. Protrusions 140 and 150 are also attached to the base 139 of housing 130 and provide mechanical support for the connector receptacles or standoffs 142 and 152. In addition, an exterior of protrusions 140 and 150 dictates the size and shape of cutouts 160 and 162 on circuit board 120 to allow the protrusions 140 and 150 to fit within the cutouts 160 and 162. The combination of protrusions 140 and 150 along with the cutouts 160 and 162 on the circuit board 120 holds the circuit board 120 in place and prevents movement of the circuit board 120 within housing 130. The protrusions 140 and 150 and cutouts 160 and 162 of circuit board 120 not only serve to secure the circuit board 120 in place within housing 130, but also aid in proper alignment of circuit board 120 within housing 130 during the assembly process.