Transmitter Power
the signal intensity of the transmitter. The higher the power radiated by the transmitter's antenna the greater the reliability of the communications system.

Transmitter
the circuit that includes logic that generates a baseband message describing the status of the inputs to the transmitter, a radio frequency oscillator that generates the carrier frequency, modulation method to impose the message onto the carrier frequency, and an antenna to radiate the signal.

Two-Way Voice
a technology for allowing a central station operator to hear what transpires after an alarm is activated and to talk to persons on the scene.