operate normally if an extra earphone plug 103 of second earphones 104 is inserted both earphones 100 and earphones 104 present sound to their respective listeners the shape and size of the casing of jack 102 may vary and the jack 102 may be located a distance up the cable away from plug 101 in an embodiment not shown the casing of jack 102 may be decorated or molded into a creative shape such as the mouth of an animal or may be plain and unmodified the jack 102 may have a cover or door over it to prevent dust or dirt from accumulating when not in use the jack 102 is of a design to accommodate the plugs of widely sold earphones the jack 102 is normally of the corresponding size and shape to and will therefore mate with plug 101 one common size is the 3 5 mm phone jack widely used in smart phones such as those sold by apple inc of cupertino calif more than one jack 102 may be added to earphones 100 so that more than one extra set of earphones can be optionally attached if the earphones that are attached to jack 102 are also modified with their own jack 102 additional earphones can be added conversely the earphones that are attached to jack 102 need not be modified.