DDS314, a new kind of static single phase electronic kilowatt-hour meter, is manufactured by the SMT technology, and is used to measure 50Hz/60Hz single phase AC active power. All of technical capability accords with standards of GB/T17215-2002 and IEC61036-2000. The meter integrates with micro-electron technology and electric power measurement technology, so it has outstanding characteristics of high accuracy, high sensitivity, high stability, long life-span, low power loss and multi-functions etc. It is an ideal replacer of the traditional mechanical kilowatt-hour meter. The RS-485/M-BUS communication interface is set in the meter, the datum of the meter can be read long-distance by the computer with the RS485/M-BUS. The meter should be installed inside house or in a box outside house with temperature from -25°C to 60°C, humidity less than 95%.