A first tubular member of an extension device includes a first tubular body portion provided with protruding portions which are so formed on the inner surface of the first tubular body portion as to protrude therefrom and extend from one axial end to the other end of the first tubular body portion. The microRNA is one or more of the following: miRNA-96, miRNA-185, and miRNA-223. Thereupon, the sub-MCU detects the operation of the operating key, and makes a timer start to count a time period. Such an arrangement may provide a relatively large surface portion for connection to the terminal. The second electrode includes a trace amount of the first substance. The second switch is disposed beside the second rotatable member.