The DDSY666 Single Phase Smart Card Meter is a robust electricity meter designed for residential prepayment applications, fully adhering to the STS Standard. It incorporates ultra anti-tamper capabilities and can operate seamlessly with an In-Home Display (IHD) for user interaction. This meter offers flexible prepayment and postpaid modes, measures both unidirectional and bi-directional energy, and supports various communication options like optical port, PLC, and M-Bus, making it an intelligent and secure solution for modern energy management.