The single beam safety devices of the MLD series are self-monitoring and have operating ranges of up to 100 m. They can, thus, be used very flexibly in a wide range of applications. Configuration is simply performed without a PC via the wiring. The single beam safety devices of the SLS series are operated in combination with a suitable test unit. Together with it, they form type 4 electro-sensitive protective equipment. They are a cost-optimized alternative if shorter ranges are needed. With their compact housing dimensions, they can be easily integrated.