Several new and useful features for a magnetic structure are provided. A number of chambers for holding water are formed within the container. In others, the heatsink is a generally planar baseplate, with ventilation openings in a side wall of the enclosure next to the baseplate for removing heat from the device. The radio wave also transmits through the reflective part, reflected by the second conductive wall, and transmits through the reflective part to become a second reflected wave in the first space. The computing node receives a module which is used to program the computing node to perform a function associated with the sensor and the actuator.