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 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) QR50C QR50D Max. Power 6W 10W Max. Flow 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 6mm / 0.24in Waterproof Class IP68 Material PC + ABS Cable Length 150cm / 4.92ft Product Size 59.5 * 49 * 42mm / 2.34 * 1.9 * 1.65in Product Weight 92g / 3.25oz Package Size 6.5 * 6 * 5.4cm / 2.56 * 2.36 * 2.12in Package Weight 104g / 3.68oz Package List: