All of its properties are in line with GB / T 17215-2002 standard, a single-phase watt-hour meter, and GB / T 17882-1999 "special requirements of multi-rate watt-hour meter" in the relevant technical requirements, the data communication protocol in line with DL/645- 1997 of the relevant requirements. This product is high accuracy and overload strong, power consumption, small size, long life; data plus a fault-tolerant error correction to ensure accurate and reliable data; power down automatically when all of the information stored watt-hour meter; LCD automatic rotation, the total accumulated significantly power, each time the cumulative rate of consumption, real-time power, the current date and time and the current rate of period signs. By IR and RS-485 communication interface function table settings, clock settings, time programming and more.