There are described diquaternary ammonium compounds of the general formula: . The base defines an interior reservoir. The bulk voltage may be set to forward or reverse bias pn junctions in the MOS transistor. The frequency synchronization bursts are transmitted by the first transceiver at a range of frequencies above and below its carrier frequency. The curved surface is configured to reduce light from passing from one end surface to the other end surface. The device comprises a first wireless transceiver communicating using a first channel of a first frequency band, a second wireless transceiver communicating using a second channel of a second frequency band, and a processor selecting one of the first and second transceivers for transmission of a wireless signal to a further device as a function of destination data of the further device.