This is for converting ER-4P to ER-4S. The total length is 12.7cm (5 inches). (Cable to use the ER-4P the same as the ER-4S) Specifications ■ Cable ■ ER-4P to ER-4S conversion ■ Total length 12.7cm (5 inches) ※ For ER-4P only I used it for the first time in a while when listing it, and there were no particular problems. Please understand that this is a used item before purchasing.