DDZY566 single phase smart keypad prepayment meter, adopting LSI and digital sampling technology, fully comply with DLMS/COSEM standards, with features of active energy metering, demand metering, power consumption metering; TOU billing, step tariff billing mode; monthly frozen, load profile storage; fraud and tampering event record; remote disconnect and reconnect, disconnect on debt, over power load disconnect, tamper event trigging disconnection; non- disconnection for friendly time section, weekend day and public holiday; Friendly credit recharge mode against credit hoard, emergency energy function, good energy consumption tips, and test mode; RS 485 and optical communication interface, etc. It passes DLMS certification test, being able to communicate with AMI systems, which make it an ideal metering device for utilities.