An electrical receptacle includes an exterior component and an interior component received inside the exterior component. The clip comprises a base section and an arm section. Therefore, the capacitor element 13 having a size sufficient to suppress switching noise of an IC chip 15 and stabilize operation power voltage can be disposed, while providing a dimensional margin. During the sensing windows, the His Bundle signal received through the His Bundle lead is sampled and a moving average is calculated to determine a signal peak.