An exercise device employing side-by-side pivotally supported moving surfaces. Following this, the third and fourth switches are turned off and fifth and sixth switches are turned on. At a contact position of the static contact and the movable contact and at a repulsed open position of the static contact and the movable contact, the angle between the main contact spring and the contact bridge is between \u2212\u03b2 and +\u03b1. The phase detecting module is used to receive the digital signal, and output a phase adjustment signal according to a part of the digital signal corresponding to the first synchronous information. In a further alternative embodiment, contact characteristics may be adjusted to be, at one end of a range of adjustment a soft contact, at the other end of a range of adjustment a solid, unyielding contact, or any intermediate between the two ends of the range of adjustment. The fail signal can cause a unique signal at the pad of the IO cell that alerts a tester to the failure of the IC device.