Radio Frequency
the alternating voltage and magnetic fields in a radio signal. Frequency is measured in cycles per second, which is usually referred to as a Hertz after the man who discovered them. A megaHertz (MHz) is a frequency of 1 million cycles per second.

Radio Spectrum
the frequency range of electromagnetic radiation used for all RF wireless communications systems.

Receiver sensitivity
the ability of the receiver to hear the transmitter's signal.

Receiver
the RF analog and logic components in the security alarm panel that processes the signals received by the antenna and reconstructs the digital message of the transmitter.