General Introduction: Adopting special large-scale integrated circuit and manufactured with advanced SMT process , DDYS22Dx Single Phase Prepayment Electronic Meter is featured whit high degree of measuring accuracy, reliable and stable performance, long service life and low power dissipation. Functions and Characteristics: LCD display ,LED indicators and mechanical register . Register displays the total amount of consumed power, LCD displays status of the meter and total and residual energy are displayed alternatively by LED indicators. IC card prepayment, purchasing before using. Meter reading card Negative energy consumption record and deduction Residential energy alarm to remind users purchasing electricity in time. Self verifying Special unit against tamper and fraud RS485 communication port (optional). In sync with the electricity vending network software, the meter is convenient to both operator and customer.