? Features Reliable: pure DC 48V power supply, the impact noise from the AC grid:? Intelligent fan speed can control, reduce the heat load is automatically reduced noise corrosion:? Using a variety of technology tools, outstanding corrosion resistance Maintenance:? Protection class IP55, outside of the room can be directly flushed clean, easy to maintain? RoHS compliant? Caller (delay) from the start, intelligent anti-misuse mode? provides a variety of alarm and RS485 communication function and protection features