Humidity : 5% to 95% relative humidity,non condensing
Operating Temperature : -40C to +85C under cover
Frequency : 60Hz +/- 5%
Nominal Voltage : 120-277V Auto Ranging Power Supply
General Specifications : Active Energy
Features : Digital Multiplication Measurement technique, Non-volatile memory,,Designed for a 20+ year life,6 digit LCD and 3 Alpha ID,77 kb of load profile memory, 1–8 channels,Uses ANSI protocol,