A system or a part of a system that can transmit and receive signals without the aid of wire. It may consist of any of the following components: (1) Wireless Repeater. A component used to relay signals between wireless receivers or wireless control panels, or both. (2) Wireless Radio Linker: A device that receives, verifies, and retransmits coded low power radio frequency alarm and supervisory signals generated by wireless smoke detectors and other wireless initiating devices. NOTE: In section 3-13 of the 1996 edition of NFPA 72, the term "wireless" was replaced with "low power radio" to eliminate potential confusion with other transmission media such as optical fiber cables. In making this change, the committee overlooked updating these definitions. (3) Wireless Smoke Detector: A smoke detector which communicates with associated control / receiving equipment using radio transmission