The wireless emergency stop system of the SAFEMASTER W series is a mobile, flexible and secure system for the emergency stop as well as control functions. The wireless system is in accordance with PL e as per DIN EN ISO 13849-1 as well as safety category 4 as per DIN EN 954-1. It demonstrates it special strengths in mobile applications as well as in extensive or complex systems with hazardous areas. Examples for use are the configuration of machines or troubleshooting and/or maintenance work on machines in automatic operation. The device distinguishes itself by a large degree of user-friendliness and good ergonomics.