-pump is powered miniature DC motor drive, drive internal mechanical eccentric eccentric motion, by an eccentric movement inside the diaphragm reciprocates.Whereby the pump chamber fixed volume of air compression (compression suction port is closed, the exhaust port is formed to open slightly pressure), stretching (compressed exhaust port is closed, a negative pressure sucking mouth open), the pumping air intakes with the outside atmospheric pressure difference, at a pressure difference, the gas pressure (suction) into the pump chamber, and discharged from the exhaust port.-pump is mainly used for medicine, gas sampling, instrumentation and other fields. Completely maintenance-free, and no oil pump, do not pollute the transmission medium.Small, stable and , hand- instrument for pump-priming, low noise, low power consumption. Especially -suitable for high negative environmental requirements.type:DC12V Mini Vacuum PumpOperating voltage: DC9V ~ 14VRated voltage: DC 12VCurrent Rating: 500mAPower Rating: 6WSuction capacity: 5L / minVacuum degree: 65kpaMaximum pressure: 120kpaNoise: Less than 60dbSuitable for 4.5-6mm tube. Mainly about the hardness. The largest part of the outer diameter is 6.5mm.Colour:silver + blackMaterial:Metal + PlasticPackage Contents:1 x Vacuum suction pumpOnly the above package content, other are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.