such as a clockwise orientation the third sign 60 is used to prompt the user that the ring 20 can be rotated along a second orientation such as a counterclockwise fig2 is an exploded perspective view of the wired control of fig1 the ring 20 substantially wheel shaped further defines a through hole 21 and three rails 22 24 in its interior typically the through hole 21 is defined in the middle of the ring 20 one end of each of the rails 22 24 is connected to the inner circumferential surface of the ring 20 and the other end is connected to the outer circumferential surface of the through hole 21 the body 30 includes a first crust 31 a second crust 32 a first body 33 and a second body 34 the first crust 31 covers the first body 33 and the second crust 32 covers the second body 34 referring to fig3 and fig4 an axis 100 is extended from an end face of the second body 34 typically the axis 100 is extended from the middle of the end face of the second body 34 the end face of the second body 34 further defines three protrusions thereon the protrusions are symmetrically around the axis 100 and are separated from each other for a predetermined space adjacent two of which can hold one of the rails 22 24 in other words each protrusion is positioned between each two rails for example a protrusion 200 is positioned between the rails 22 and 24 a protrusion 300 is positioned between the rails 22 and 23 and a protrusion 400 is positioned between the rails 23 and 24 the protrusion 200 is mounted with a circuit board.