Systems, methods, and devices enabling peak time power savings are disclosed. The substrate unit has a touch surface on the top surface thereof for an external object to touch in order to operate a touch-controlled module. A speed ratio as a ratio between a revolution speed and the rotation speed is calculated based on a sensed signal of both sensors 24, 25. The main controller provides power to the load via the corresponding mobile module. If a content is recorded in case it has been set that the content has to be checked out, the content having been recorded in the content data base is checked out to the portable device. The implant includes at least one marker having a first configuration when the implant is relaxed or not tensioned in a desired manner and a second configuration when the implant is tensioned as desired.