Abstract: An electrical device is provided. It is characterised by comprising: at least one operative element for performing the assigned duty of the device; a supercapacitor comprised of nano-carbon containing electrodes, an ionic liquid electrolyte and an ion-permeable membrane for powering the operative element and/or recharging an associated battery; a charging circuit for recharging the supercapacitor by means of an external source of power; a control circuit for controlling operation of the operative element; a monitoring circuit for monitoring one or more parameters characteristic of the performance of the supercapacitor and/or the operative element and for generating corresponding status information; a transmitter for transmitting a first signal comprising the status information to a remote receiving location and a receiver for receiving a second signal from the remote receiving location comprising instructions to be acted on by the control unit and optionally the operative element.