... Comprise of emitter(transmitter), receiver, controller, connection cables and mounting fittings. 2. SNC series's specification * Fast ... indicator.Receiver:Output indicator.Type Z controller:Relay 1,2 indicator,passing light indicator,intercepting light indicator ... shellAluminum Emitter and receiver light filterOrganic glassZ type controller shellPlasticSingal cableEmitter 8m,4-core,connector /receiver ...