An electronic device includes an illuminable indicator, a presence detector, and a controller. In addition, some embodiments also provide for mapping of a device context for one of the devices to an identity context for the identity. A first input signal based on the first detector signal adjusts the phase difference. With the elongated member turned end for end, the screw is free to clamp the solid wire against the other side of the power conductor. A flow control device controls a flow rate of the cooling fluid through at least part of the cooling duct assembly, to maintain a predetermined average temperature of the cooling fluid in the cooling element.