Functions: The main function of the keys on X-K4 is to trigger the emergencybroadcast task. The audio source of the task can be defined in the configsoftware. The operation mode of the keys can be configured as pressor toggle. The LED indicator shows the broadcast status of the task. FEATURES & BENEFITS · Power supply from X-NPMS or X-NPMK · Emergency indicatorfor each key · Four configurable keysFlexible labelslotwithwith transparentchangeable labelscovers to preventaccidentaltouches · Each X-NPMS or X-NPMK can connectupto 8 extensionkeypads · Supportrack mountordesktop flush mount · CE& CB Complied