This miniature DC motor-driven pump utilizes an internal mechanical eccentric motion to create a reciprocating diaphragm action. This results in a fixed volume of air being compressed in the pump chamber (when the suction port is closed, the exhaust port opens slightly under pressure) and stretched (when the exhaust port is closed, a negative pressure forms at the intake). The pump operates by creating a pressure difference, allowing atmospheric air to enter the chamber and subsequently discharge through the exhaust port. The pump is primarily designed for use in fields such as medicine, gas sampling, and instrumentation. It is completely maintenance-free, does not require oil, and does not contaminate the transmission medium. Compact and stable, it serves well as a hand-held pump with low noise and power consumption. Particularly suitable for environments requiring high negative pressure. Type: DC12V Mini Vacuum Pump Operating voltage: DC9V ~ 14V Rated voltage: DC12V Current Rating: 500mA Power Rating: 6W Suction capacity: 5L/min Vacuum degree: 65kPa Maximum pressure: 120kPa Noise level: Less than 60dB Compatible with 4.5-6mm tubing, with the maximum outer diameter being 6.5mm. Color: Silver + Black Material: Metal + Plastic Package Contents: 1 x Vacuum suction pump Note: The package contains only the items listed above, and others are not included. Light variations and different displays may cause slight color differences from the actual product. Allowed measurement error is +/- 1-3cm.