DTZY217 (CP3-4) Three Phase Four Wire CPU Card Prepaid Electronic Meter is a TOU prepayment energy meter. The main functions of the meter are metering active energy, measuring instantaneous quantity, maximum demand, recording data of freeze, current loss, broken phase, meter cover open, overpower alarm, IC card reading/writing, energy charge balance alarm, energy balance credit and etc.it has multiple optional functions which can be optional through configure table as per requirements.