Da'irar saka na'ura tasha motsi firikwensin yana tare da ƙarfin lantarki 12V da 24V.
Wannan 12V/24V tasha motsi yarn firikwensin firikwensin don injin saƙa madauwari an ƙera shi don gano kwatsam kwatsam a cikin yadudduka masu sakawa akan injunan saka madauwari.Wannan firikwensin karya yarn na tsayawa yana sanye da fiber na gani, infrared (IR) diode mai haske (LED) da na'urar gano wutar lantarki.Yana gano lokacin da igiyar zaren sakawa ta karye, yana dakatar da zagayowar sakawa kuma yana taimakawa hana lalacewar zaren.
Yana da sauƙin shigarwa da amfani, kuma ya dace da nau'in yadudduka masu yawa.