This is where performance and price meet. The SG4 series of light curtains all the basic features in Type 4 applications with a price to make anyone happy. With mounting brackets that rotate, no physical connection necessary between emitter and receiver to synchronize, and configuration that can be accomplished without external control units or supplementary cables, the SG4 Type 4 light curtains are one of the easiest to install on the market today. In addition, the 7 segment LED display found on the emitter and receiver unit makes alignment and servicing easy.