ESS022 Addressable warning sign Visual/Audible alarm sign with certified EN54-3 audible signal capability and certified EN54-23 visual signal capability. The sign comprises an EM312SR module. It must be connected to the loop and a 24Vdc power source. As well as activating warning signals, this device provides an input for a conventional alarm button and a relay for the control of an electromagnetic stop. It is a cost-efficient solution for the complete control of a Fire Exit (REI Door)