... AIR, OCCL. OVER,EMPTY Alarm informationOVER,OCCL., Air , Empty, Low battery, control abnormal, no AC power supply, installation error, serious low ... rate)Power supply: AC100-240V, 50/60 Hz BatteryRechargeable lithium polymer battery,7.4 V,1600mAh.Max. power consumption 25W, can ... run for 4h after being recharged. Battery rechargeWhen the pump is connected to the AC power supply ...