To improve assembly precision of a fuel cell by improving a sealing property. The support structure comprises a plurality of pole members that emanate from an upper assembly. Densities of the components have been selected such that the density of the second placed component is sufficiently higher then the density of the first placed component to facilitate gravity mixing of the two components as the second placed component moves through the first placed component and in the process activation occurs. A current sink is coupled to the power source and is configured to be activated in response to the error message. The audio device can include wireless networking electronics so as to allow the device to interact with other wireless network devices. If the receiver also directly receives the communication signal from the transmitter, the receiver can determine the location of the wireless communication device relative to the transmitters.