HP Ethernet 1Gb 4-port 331T Adapter - Manual (Page 12)

Specifications 12
Power and environmental specifications
Specification Value
Operating Temperature—0° to 55° C (0° to 131° F)
Humidity—15 to 80% relative humidity, non-condensing
Non-operating Temperature—40° to 70° C (0° to 158° F)
Humidity—10 to 90% relative humidity, non-condensing
Power 4 W typical, 5 W maximum