A wireless alarm signal repeater extends range by:

• A. Extends the range of a wireless transmitter, amplifies a transmitter's signal before sending it again, transmits and retransmits, reduces some false alarms. Reduces spots and expand range usually AC powered.
• B. A device that jams signals.
• C. A battery backup unit.
• D. A siren horn.

Answer: (A)

The essential idea is that a wireless alarm signal repeater acts as a relay to extend coverage. It listens for the wireless signal from the transmitter, boosts or amplifies that signal, and then re-transmits it onward to the control panel or other devices. By doing this, signals can travel farther and through obstacles, reducing dead spots where a sensor’s message might not reach the panel. Because maintaining continuous operation is important, these repeaters are usually powered from AC mains rather than relying on a battery. They’re not meant to jam signals, nor are they a battery backup unit or a siren horn.