... Protection with CE &ROHS Digital Wireless Power Meter, power meter,energy power meterMulti-function: with voltage, current, power, power factor and power measurements, as well as the ... ; 13. Communication distance: "50 meters (open space);14. Power frequency withstand voltage: AC220V power source, the power / input / output between: ≥ AC2kV/min.1mA;15 ...