An electronic device includes a heat generating member arranged in a body, and a heat transmission member of a shape of a three-dimensional body having at least a first surface that is joined to the heat generating member and a second surface that is joined to an inner surface of the body. The addition of the shut-off device provides a full-rail differential logic circuit with shut-off that does not experience the dip experienced by prior art full-rail differential logic circuits and is therefore more power efficient. At least one resilient element biases the next to uppermost rung away from the uppermost rung to ensure that the locking pin of the uppermost rung engages a hole in the uppermost stile section as the ladder is lowered. An additional stretch fit seal can be incorporated into the lid. An illumination chamber for guiding the light of the light source to the indication plate is formed in the frame.