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By certification 
Meter Single Phase is a Single-Phase Two-Wire prepay meter, which is designed and manufactured by digital sampling processing technology, SMT technology. The Meter Single Phase has a high level performance in accuracy, reliability, anti-tamper, wide voltage range, high temperature& high humidity environment.
● Support import and export active power metering function.
● Tariff Control: up to 10 steps tariffs.
● Prepay: Friendly mode, 3 level balance alarm.
● Billing: up to 12 monthly billing
● Event record: disconnect/reconnect event, purchase event, tamper event, relay event.
● Optical Communication
● Relay Control: the relay disconnect/reconnect base on current or power.
● Replaceable Battery for RTC
● Support Multi-functional Card
http://www.jianxintechnical.com/
