DDSF450 Single-phase Electronic Multi-tate Watihour Meter is a full-electronic meter.its specially designed for the urban electrical network rebuild of national relative zobes,It has advantages fo low power consumption,high overoad,convenrent operauon and high proportion of function and price,etc. It has the functions of measuring level vallel active summation electrity quantity,The mechanical LCD Display can show level and valley electricity quantity and,colod,data.It can pringram the level and valley part freely,8time parts(at prsesent only 2time parts),4fees,set atrandom.It has the functions of realizing automatic reading and time check with handset.The active electicit quantity pulse energy outputs,output pulse can be used for calibi rating the meter and collecting the electricity,It is equipped with Rs485 interface.