This is a size submersible pump. It's equipped with a brushless motor providing smooth and quiet operation than a non-brushless pump.

Features:
Brushless pump, permanent rotor, maintenance-free.
Enameled wire coil and circuit board are by epoxy resin.
The coil adopts pure enameled wire, lower rise and longer span. 
Amphibious pump, you can use it in the or out of (follow the installation instruction).
USB DC5V input, very convenient for power .
IP68 waterproof grade, totally submersible in the .
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 .
Small size, high efficiency, low noise.
Suitable for aquarium, fountain, car cooling, cooling system and circulation systems.

Note:
1. Please check the voltage and of the pump before on. 
2. Please cut off the before you install/put in/take away the pump from the ; otherwise, the pump can't due to the in it.
3. It can be used in the 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 repeatedly for several times to eliminate the in the pump impeller and the .
6. When the pump is used in high environment(100°C), it can only be installed with non-diving method.

Specifications: < bgcolor="#cccccc" height="9" width="174">Model(Optional) < bgcolor="#CCCCCC">QR50A < bgcolor="#CCCCCC">QR50B < bgcolor="#" height="19" width="174">Max. < bgcolor="#">2.4W < bgcolor="#">4.8W < bgcolor="#" height="9" width="174">Max. Quantity < bgcolor="#">250L/H < bgcolor="#">300L/H < bgcolor="#" height="10" width="174">Max. Lift < bgcolor="#">200cm / 6.56ft < bgcolor="#">300cm / 9.84ft < bgcolor="#" height="4" width="174">Max. Current < bgcolor="#">480mA < bgcolor="#">960mA < bgcolor="#" height="4">Rated Voltage < bgcolor="#" colspan="2">USB DC5V < bgcolor="#" height="4">Noise < bgcolor="#">Less than 35dB < bgcolor="#">Less than 37dB < bgcolor="#" height="4">Lack of conservation < bgcolor="#">No < bgcolor="#">Yes < bgcolor="#" height="10" width="174">Outer Dia. of Inlet/ < bgcolor="#" colspan="2">8.5mm / 0.33in < bgcolor="#" height="20" width="174">Inner Dia. of Inlet/ < bgcolor="#" colspan="2">6mm / 0.24in < bgcolor="#" height="4" width="174">Waterproof Class < bgcolor="#" colspan="2">IP68 < bgcolor="#" height="4">Material < bgcolor="#" colspan="2">PC + ABS < bgcolor="#" height="10">Max. < bgcolor="#" colspan="2">100°C < bgcolor="#" height="20">Cable Length < bgcolor="#" colspan="2">150cm / 4.92ft < bgcolor="#" height="20">Product Size < bgcolor="#" colspan="2">59.5 * 49 * 42mm / 2.34 * 1.9 * 1.65in < bgcolor="#" height="9">Product Weight < bgcolor="#" colspan="2">90g / 3.18oz < bgcolor="#" height="10">Package Size < bgcolor="#" colspan="2">6.5 * 6 * 5.4cm / 2.56 * 2.36 * 2.12in < bgcolor="#" height="20">Package Weight < bgcolor="#" colspan="2">104g / 3.68oz
Package List: H20628-1
1 * DC5V Brushless Pump
1 * Filter
1 * User Manual(English)