1. The -pump is driven by a -DC motor, which drives the internal mechanical eccentric eccentric motion, and the eccentric motion drives the internal reciprocating motion of the diaphragm.2. In this way, the fixed volume of in the pump chamber is compressed (the compressed suction port is closed, and the exhaust port forms a slightly open positive pressure), stretched (the compressed exhaust port is closed, and the negative pressure suction port is opened). The pressure difference, at which the gas pressure (suction) enters the pump chamber and is discharged through the exhaust port.3. -type vacuum pumps are mainly used in electrical products, industrial products, vacuum -keeping machines, automobile exhaust gas reforming equipment, gas analysis and sampling, instrumentation and other fields. Completely maintenance-free, no oil pump, no pollution to the transmission medium, and can work continuously for a long time.4. Small size, stable and reliable, hand-held pump suction instrument, low noise, low consumption. Especially suitable for high negative environmental requirements.Working voltage: DC9V~14VRated voltage: DC 12VRated current: 500mARated : 6WSuction: 5L/minVacuum degree: 65kpaMaximum pressure: 120kpaNoise: Less than 60dbSuitable for 45-6mm tube. Mainly about hardness. The largest part of the outer diameter is 65mm.color:Black + silverMaterial:ABS+MetalPackage Contents:1 x vacuum suction pumpOnly the above package content, other products are not included.Note: Light 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.