The pump is driven by a DC motor, which drives internal mechanical eccentric motion, and the eccentric motion drives the internal reciprocating motion of the diaphragm. In this way, the fixed volume in the pump chamber is compressed (the suction port is closed, and the exhaust port forms a slight positive pressure) and stretched (the exhaust port is closed, and the suction port opens under negative pressure). This pressure difference enables gas to be drawn into the pump chamber through the suction port and discharged through the exhaust port. Vacuum pumps are mainly used in electrical appliances, industrial equipment, vacuum holding machines, automotive exhaust gas treatment systems, gas analysis and sampling, instrumentation, and other applications. They are completely maintenance-free, oil-free, non-polluting to the medium, and capable of continuous long-term operation. Compact size, stable and reliable performance, handheld suction pump, low noise, low power consumption. Especially suitable for environments requiring high vacuum performance. Working voltage: DC 9V–14V Rated voltage: DC 12V Rated current: 500mA Rated power: 6W Flow rate: 5L/min Vacuum level: 65kPa Maximum pressure: 120kPa Noise level: <60dB Compatible with tubing of 4.5–6mm diameter. Outer diameter: 65mm Color: Black + silver Material: ABS + metal Package contents: 1 x vacuum suction pump Note: Lighting conditions and display settings may cause slight color variation between the image and the actual product. Measurement tolerance: ±1–3cm. Note: Please allow 1-3 mm error/1-3g weight error and actual product color may vary due to lighting conditions.