Accuracy: Class 1.0 Class 2.0 Power Consumption: less than 1W/6VA Rererence Voltage(V): 220V, 230V, 240V Basic Current(A): 1.5(6)A, 2.5(10)A, 5(20)A, 10(40)A, 20(80)A (extended current is available on request) Operating Temperature: from -20 degree C. to +55 degree C. Relative Humidity: less than 85% Main Functions 1,Both-way electric energy metering. Provides precise positive-Negative active energy metering and one-way accumulating. Used for power metering and advance purchase of AC single-phase current rated. 2,Single-phase timesharing electricity metering,4 rates and 12 time-periods. 3,Automatic monthly settlement: Set a random day as meter reading and 12 months' consumption data can be reserved. 4,Load curve recording: Set a representative day and power consumptions at each right hour from 0-24h can be recorded. 5,Advance purchase quantity, preset maximum load-limit and IC card password .IC card transfers data and realizes data (including total consumption, remaining quantity, accumulated quantity and total purchases etc .)backward reading. 6,Storage of leave-factory serial number, meter constants, initial data and the user's name and address etc.. 7,Alarm and switch off when overload. Alarm at low remaining power to remind user of timely purchasing. 8,Far infrared communication. Comply with stipulations of DL/T645-1998 Multi-functional Watt-hour Meter Protocol.