... stable, after filtered and regulated, the output sine wave from pure-online double conversion technology, not only has the ... (with increase of 100m, it will reduce output of 1% )max 4000mCommunication interfaceRS232Remote signalDry contact ( battery low, ... between failures300,000 HoursotherDustproof and damp-proof, isolating inverter transformer, Lightning Surge absorption, Static switches and manual ...