An electrical connector includes a terminal that includes a front terminal portion, and a rear terminal portion the contact position of which is located further from the insertion opening of the connector than the contact position of the front terminal portion, and that is electrically connected with a mating terminal as an object to be connected. The time-out period is restarted each time a designated key value is received when each key value is received in a proper sequence. Methods of using the applicator are also disclosed. Each of the first lens and the second lens includes a central lens portion, and a flat peripheral portion surrounding the lens portion.