We used DC12V voltage to test pumping, and although the rate of the pump was not large,the pressure was very strong. If the mouth of the pipe is slightly reduced by hand,the water column out straight and hit the water with considerable force. The characteristic of a squeeze pump is that it has a small rate but good outlet pressure,making it suitable for pumping viscous/non viscous liquids such as ink. The peristaltic pump has a three roller structure inside. The lower half of the three rollers is a gear. The large gears on the three rollers and the small gears on the motor shaft form a reduction ratio, which is a relatively novel design. We found during the testing process that due to the lack of plastic particles at both ends of the hose and the absence of fixed connections to other accessories, the silicone hose would move during the pumping process. So when in actual use, the silicone tube should be securely connected to other accessories. Voltage: DC6V Current during pumping: 0.5 A Voltage: DC12V Current during pumping: 0.6 A Color: As Shown Material: plastic Package Contents: 1 x Pump Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: The product may have a slight tolerance of 1-3 mm/1-3 g in size/weight, and the image color may differ from the actual item due to lighting.