Water Pump with Controller, Submersible and Inline Return Pump Efficient Energy-saving Variable Frequency for FishTank,Aquariums,Fresh water,Sea Water,Fountains,Sump,Hydroponic,Pond,and Eles Description It use advanced intelligent energy conservation technology, save 2/3 energy of the traditional water pump, at the same time high-efficient energy saving around 70%. CPU will self-check when power on and automatically start the pump after 3 seconds LED flashing water shortage protetion - detecting anhydrous run 1 minute, stop for 12 seconds and restart for 15 seconds, shut off the output after 5 times, you must replug the cord into the power supply to restart the pump(shut off the power at the same time display position “LO”) Overload protection - when the power is more than 150% of the normal power, the CPU will immediately shut off the output into the protection state and display position "OP" Short-phase protection, when one of the phase line of the pump is block or short circuit, the CPU will automatically into protection state and display F3 The use of high strength wear resistant and corrosion resistant ceramic shaft ceramic set, can be use for seasaterifresh water at the same time and have no copper. three headflow/power adjustable function, users can choose the function according to their need. It has the memory function, every time restart the power will have the same parameters as before. 4 Models Pump are same AC110V, 60Hz NZ-6000 Model - Output : Gear1(5000Liter/1320Gallon) Gear2(5500Liter/1453Gallon) Gear3(6000Litre/1585Gallon) Per Hour NZ-12000 Model - Output : Gear1(10000Liter/2642Gallon) Gear2(11000Liter/2906Gallon) Gear3(12000Litre/3170Gallon) Per Hour NZ-18000 Model - Output : Gear1(16000Liter/4227Gallon) Gear2(17000Liter/4491Gallon) Gear3(18000Litre/4755Gallon) Per Hour NZ-25000 Model - Output : Gear1(21000Liter/5547Gallon) Gear2(22000Liter/5812Gallon) Gear3(23000Litre/6075Gallon) Per Hour