5CH High Power Switch Actuator (with Emergency Function) is a multifunction relay with emergency function. It has 2 emergency relay channels and 3 relay channels. The emergency relay channel supports connecting emergency power supply automatically, and providing power to emergency relay channels when the mains power is cut off. The relay channel has relay switch control function. In conjunction with HDL Hotel Room Management System, the relay module can control lights, air conditioners, curtains and plugs etc.