... present, the smart water meter in the market(IC card water meter, RF card water meter, prepaid water meter etc.) all use the ... unfreezePrepaid quantity: 4 digit mechanical counter, anti electric-interference, max 9999m3Remainder quantity: four digit mechanical counter ... electric-interference, max 9999 m3Overdraw: insert the recharge device to overdraw after closing the valve alarmMode of recharge: IC card ...