Radios with Quik-Call I decoders may monitor all system traffic or remain muted until called, depending on the system design. When the radio receives the correct tone pairs in the proper sequence, it may momentarily buzz or sound a <abbr title="Brand name of a piezoelectric sounding device by Mallory">Sonalert</abbr>. An indicator light may turn on and remain latched on. In most systems, the radio's receive audio would latch on if normally muted. In the "Emergency!" television show, the decoder turned on the lighting, activated the overhead loudspeakers, activated the horn/klaxon, and probably turned off cooking appliances.