A GPS tracking system for handcuffs and feetcuffs, which includes a sensor, fitted with a GPS tracker, disposed within a mobile restraining device. Here, the audio streams being canceled includes the computer audio stream of an application being run or a material being presented online during a web conference andor the audio stream received from the rest of the group of participants at the conference call. Each holding slot includes one or more contoured compartments in which tools rest when engaged with the handle. The capacitive value of the memcapacitor is adjustable within a range by way of an applied programming voltage.