1Pump cover: screw by hand, remove quickly for easy tube replacement 2Equipped with low noise dc motor, quiet and has long life 3Guide roll take adjustment action to facilitate the replacement of the pipe, to avoid the lack of experience to clamp and damage the pipe 4Roller bearing adopts wheel frame, quiet, long service life 5Stainless steel screws, anti - rust and corrosion Features: Pump cover: screw by hand, remove quickly for easy tube replacement Equipped with low noise dc motor, quiet and has long life Guide rolltake adjustment action to facilitate the replacement of the pipe, to avoid the lack of experience to clamp and damage the pipe Roller bearing adoptswheel frame, quiet, long service life Stainless steel screws, anti - rust and corrosion Specification: Motor: 12V dc motor Dc motor current: 0.5-1.4A Working environment: 0-40, relative humidity 80% Medium flow: the flow of the pump depends on the positive and negative connection Flow range: 0-400ml/min Tube: inner diameter * outer diameter (6.4mm * 9.6mm) / 0.25 * 0.38in(approx) Wall thickness: Approx. 1.6 mm / 0.06in Maximum diameter: Approx. 9.6mm / 0.38in Tube material: transparent silicone tube Shell material: PC Roller: POM Roller type: ball bearing Weight: 274 g / 9.7 oz(approx.) Package list: 1 x Peristaltic Pump 1 x wrench Note: 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.