Specification: Rated Voltage: 220/ 230/ 240V Rated Frequency: 50/ 60Hz Tariff option: Programmable 4 tariffs(sharp, peak, shoulder and off-peak), 10 day-periods, 2 time zones(customization available via software programming) Communication interface: Infrared or RS485 port Anti-tampering: Simultaneous sampling of phase current and neutral current Basic Current (Max. Current): 1.5(6)A, 2.5(10)A, 5(20)A, 5(30)A, 5(40)A, 10(50)A, 10(60)A, 10(80)A, 10(100)A, 20(80)A, 20(120)A Current range: 1.5-120A Overload Capacity: 4-10 lb Starting current: 0.4-l0lb(Class 1.0), 0.5-lb(Class 2.0) Power Consumption: <=2W /5VA (total) Impulse Output: 80ms Time accuracy(day error): within 0.5seconds/day Data backup battery voltage: 3.6C(DC) Battery capacity: 1000mah Data memory: EPROM Type of connection: Meter board connection, through case Nos. of wires: two wires Register: LED display (option) / LCD display (option) Running with no load: built-in anti-running logic design Meter's Constant(imp/kWh): 6400,3200,1600 Limit temperature range of operation: -25centigrade to 55centigrade Annually average relative humidity: <=85% Dimension: 132x110x55(mm) Accuracy: Class 1.0 or 2.0 Product life (MTTF): 15 years