This is a mini size submersible water pump. It's equipped with a brushless motor providing smooth and quiet operation than a non-brushless water pump. Features: Brushless pump, permanent magnetic rotor, maintenance-free. Enameled wire coil and circuit board are by epoxy resin. The coil adopts pure copper enameled wire, lower temperature rise and longer life span. Amphibious pump, you can use it in the water or out of water(follow the installation instruction). 5.5*2.1mm female DC12V for power input. IP68 waterproof grade, totally submersible in the water. Detachable design, providing convenience for cleaning work. With a filter, avoiding blocking the inlet. 4 rubber suckers on the bottom, can adsorb on the smooth surface and reduce noise and vibration. Small size, high efficiency, low noise. Suitable for aquarium, fountain, car cooling, computer water cooling system and circulation systems. Note: 1. Please check the voltage and power of the pump power before power on. 2. Please cut off the power before you install/put in/take away the pump from the water; otherwise, the pump can't outlet water due to the air in it. 3. It can be used in the water or other liquids(without particles and impurities); NOT for viscous and acid-base liquids. 4. DO NOT dry burn the pump, otherwise it would be damaged. 5. Switch on-off the power repeatedly for several times to eliminate the air in the pump impeller and the . 6. When the pump is used in high temperature environment(100°C), it can only be installed with non-diving method. Specifications: Model (Optional) QR50C QR50D Max. Power 6W 10W Max. Quantity 300L/H 400L/H Max. Lift 300cm / 9.84ft 400cm / 13.12ft Max. Current 500mA 830mA Rated Voltage DC12V Noise Less than 35dB Less than 37dB Max. Liquid Temperature 100°C 60°C Lack of Water Protection No Yes Outer Dia. of Inlet/Outlet 8.5mm / 0.33in Inner Dia. of Inlet/Outlet