Feature 1、Brushless pump, permanent magnetic rotor, maintenance-free. 2、Enameled wire coil and circuit board are sealed by epoxy resin. 3、The coil adopts pure copper enameled wire, lower temperature rise and longer life span. 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 sealed 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). USB DC5V input, very convenient for power supply. 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. on-off the power repeatedly for several times to eliminate the air in the pump impeller and the pipe. 6. When the pump is used in high temperature environment(100°C), it can only be installed with non-diving method. Specifications: Model(Optional) QR50A QR50B Max. Power 2.4W 4.8W Max. Flow Quantity 250L/H 300L/H Max. Lift 200cm / 6.56ft 300cm / 9.84ft Max. Current 480mA 960mA Rated Voltage USB DC5V Noise Less than 35dB Less than 37dB Lack of Water conservation No Yes Outer Dia. of Inlet/Outlet 8.5mm / 0.33in Inner Dia. of Inlet/Outlet 6mm / 0.24in Waterproof Class IP68 Material PC + ABS Max. Liquid Temperature 100°C Cable Length 150cm / 4.92ft Product Size 59.5 * 49 * 42mm / 2.34 * 1.9 * 1.65in Product Weight 90g / 3.18oz Package Size 6.5 * 6 * 5.4cm / 2.56 * 2.36 * 2.12in Package Weight 104g / 3.68oz Package List: 1 * DC5V Brushless Pump 1 * Filter 1 * User Manual(English) Package List 1 * DC5V Brushless Pump 1 * Filter 1 * User Manual(English)