Features:Pump cover: screw by hand, remove quickly for easy tube replacementEquipped with low noise dc motor, quiet and has long lifeGuideroll take adjustment action to facilitate the replacement of the pipe, to avoid the lack of experience to clamp and damage the pipeRoller bearing adopts wheel frame, quiet, long service lifeStainless steel screws, anti - rust and corrosionSpecification:Motor: 12V dc motorDc motor current: 0.5-1.4AWorking environment: 0-40, relative humidity 80%Medium flow: the flow of the pump depends on the positive and negative connectionFlow range: 0-400ml/minTube: inner diameter * outer diameter (6.4mm * 9.6mm) / 0.25 * 0.38in(approx)Wall thickness: Approx. 1.6 mm / 0.06inMaximum diameter: Approx. 9.6mm / 0.38inTube material: transparent silicone tubeShell material: PCRoller: POMRoller type: ball bearingWeight: 274 g / 9.7 oz(approx.)Package list:1 x Peristaltic Pump1 x wrenchNote:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering..