... -reliability, dual relay output 4. Perfect anti-interference SNB Series: 1. Fit for kinds of Machinery Fields*Comprise of emitter ... receiver, controller, connection cables and mounting fittings. 2. SNB series's specification * Fast response time <20ms.* LED indicator,easy to ... Reset function: When any beam(one or more) is obstructed, equipment can't run till press "Reset" Button, light passing recovers ...