A system includes a first device to select and transmit a first code by a transmitter to a remote device controlling a mechanism or access to a database or a computing device. The remote device implements a switching device based on the first code; the transmitter in the first device generates a first sequence of signals based on the first code; the switching device in the remote device processes the first sequence of signals and activates the mechanism based on the processing of the first sequence of signals. The first device may be a smartphone, a fob, an access card, or any other computing device.