6. The device of claim 5 , wherein the control element comprises a control knob rotatably coupled to the housing, wherein the code is received through rotation of the knob.
6. The device of claim 5 , wherein the control element comprises a control knob rotatably coupled to the housing, wherein the code is received through rotation of the knob. 7. The device of claim 6 , wherein the code comprises at least one of a series of numbers associated with positions of the knob, a series of letters associated with positions of the knob, a series of alphanumeric digits associated with positions of the knob, a series of rotational directions, or a combination of rotational directions and pauses between rotations.