... two-wire prepayment kWh meter, one meter with one IC card.upper counter display total energy used, down LED count ... 1 DDSY Type Single-Phase Electronic Prepaid Kilowatt Hour Meter (IC card type) is developed on basis of DDS Type ... AC Active Kilowatt Hour Meter and GB/T18460-2001,IC Card Prepaid Power Sale System.2.2 When voltage ... 10 years. Single-phase electronic Prepaid kilowatt-hour meter (IC card)